Blockchain Beach is reporting these steps based on available public information and have linked to the original sources in the article. We have not spoken to any members of Block.one to complete this post. Users are responsible for their own tokens and Blockchain Beach does not accept liability for the EOS Mainnet token swap.
The much anticipated EOS smart contract operating system protocol launches its Mainnet on June 2nd, 2018. This will culminate the end of a year long Token Generation Event, a snapshot for exciting Airdrops (including Everipedia), and its own set of fraudsters attempting to swindle the public of their EOS tokens.
The EOS token sale was a sale of an ERC-20 token that will be replaced by an EOS Mainnet token upon launch. The EOS website allows token purchasers from the daily sale to easily register their tokens and let EOS's parent company, Block.one, given they are located outside of the United States and China, regions that are not allowed to participate in the main sale.
So what does that mean for US-based EOS token holders who purchased their tokens on an Exchange (or those who purchased in the main sale, but have since moved the tokens to a different wallet)? You have a few options, each with their own pros and cons.
Option 1: Register Your Tokens Using a Software Wallet
Why: Using a Software Wallet gives you complete control of your tokens and all rights that are associated with them. Two of those rights include voting/governance and airdrops:
Voting/Governance - The decisions about how the EOS network will operate will be made by the token holders by temporarily staking their tokens. The better the decisions of the community, the better the network will scale and perform (the first major decision is who the initial 21 block producers on the network will be, a vote happening upon the launch of the EOS Mainnet). If someone else (like an exchange) is holding your private key, they control your vote.
Airdrops: EOS DApps, including Everipedia, will be giving free tokens to all EOS token holders. If you hold your own EOS tokens, the airdrops will be deposited into your software wallet (see below in this article for more about options with exchanges, but an exchange is never required to support an airdrop).
Why Not: If you're not interested in voting and would rather not have to manage our own Private Keys, even if you will miss airdrops of other tokens.
Instructions:
(Blockchain Beach's preferred software wallet is MyCrypto (which was previously hard forked from the popular MyEtherWallet). If you have not previously created your MyCrypto wallet, you can follow our tutorial here).
These screenshots are from the Legacy version of MyCrypto, which can be found at https://legacy.mycrypto.com/ and also work for MyEtherWallet. MyCrypto recently updated their interface and we will work to complete a guide for the new interface, if necessary. You can also click to the new interface at the top of the MyCrypto site.
Once you've created your wallet, use the below steps to register your EOS tokens (these steps were recreated by following a top tutorial on Steemit):
Step 1: Send a small amount of Ethereum (ETH) from an exchange/broker to your wallet. This is because every Ethereum transaction requires a small amount of ETH as a transaction fee, known as gas. Depending on the time of day and the current volume on the network, the fee should be the equivalent of a few dollars (USD). However, if you don't have enough ETH in your wallet, your transaction will fail and your wallet will not become registered for your EOS tokens.
Step 2: Visit the EOS Token Generator. This is a Github site, built by user 
Step 3: When you click, "Generate EOS key," it will provide you with a Public and Private EOS key.
DO NOT LOSE THESE KEYS:
Step 4: Once you have your EOS keys, visit your MyCrypto wallet and select the "Contracts" tab:
Step 5: On the right side, you'll find a "Select Existing Contract" drop down menu. Click on the menu, scroll down, and select "EOS: Contribution:"
Step 6: Click the "Access" button to reveal further instructions. From the "Select a function" dropdown menu at the bottom, select "register."
NOTE: We have already completed step one and please disregard steps 3 & 4 in the screenshot above.
We are now only concerned with "Step 2. Register / Map your EOS Key."
Step 7: Paste your EOS Public Key under the "key string" (not your Private Key):
Step 8: Link your MyCrypto Wallet to your EOS address by unlocking your wallet using your preferred method. For more information on this process and the preferred methods, please refer to our MyCrypto guide:
Step 9: Click "Write" to bring up a transaction pop up. Click "Generate Transaction" to show your transaction:
Step 10: Click "Yes, I am sure! Make transaction." If you see a green bar at the bottom, your transaction has been broadcast to the network and you are done (given you put enough ETH in your account to complete the transaction.
If you see a red bar, you likely did not complete "Step 1" from above or the ETH you sent from your exchange has not yet appeared in your wallet. You'll need to double check that step or wait for that transaction to complete.
If you want to check if you did it correctly:
Step 1: Give your transaction time to process and then return to the front page of MyCrypto and click on the "Contracts" tab. Complete Steps 4, 5, & 6 from above, but instead of selecting "register," you will select "keys:"
Step 2: Enter your MyCrypto Public Key address into the address field and click "Read." If your transaction was completed correctly, your EOS Key should appear under where it says "string" (if it has not appeared after a few seconds, then your transaction has not yet completed):
Step 3 (optional): If you think you did the transaction properly, but do not see your EOS Key, visit your wallet via the View Info tab and open your wallet using your preferred method (we recommend "View w/ Address Only"):
Step 4 (optional): On the right side, click on the link to ETH (https://etherscan.io). This will show your transaction history and whether or not your transaction is failed or pending:
Transactions (like the ones in the example above) with a red exclamation point have failed.
Option 2: Leave Your Tokens on a Supported Exchange
There are a few exchanges that have offered to register the tokens for you and hold them in the wallets they provide. These wallets are what you see when you check your online trading account, but you do not have control of your private keys. Two of your options are:
Why: If you don't want to take the steps to complete the first option and manage your own tokens. You think you may mess up the registration process and lose your current tokens without further assistance.
Why Not: There is no promise of how long it will take for them to complete the process. It is likely that you will not be able to participate in the early voting and also likely that airdrop snapshots will be taken and you may not get a number of free tokens from companies building on EOS.
Instructions:
Transfer or Keep your tokens on one of the following exchanges:
Binance - Their official statement is as follows:
Binance would like to confirm that we will support the EOS MainNet Token Swap. We will handle all technical requirements involved for all users holding EOS.
Kraken - Their official statement is as follows:
On June 2, EOS will be transitioning from the Ethereum network to the EOS MainNet chain. Kraken will fully manage the token swap involved in this transition. All clients with EOS balances in their Kraken accounts do not need to move these tokens or do anything else in order to have their EOS converted from the Ethereum network to the EOS MainNet.
Option 3: Metamask
Some users are currently holding their tokens in the Chrome Browser based wallet, Metamask. If you are located outside of the United States and China, you can easily register your tokens using the EOS website.
If you are located in the United States or China, you cannot access the registration page of the EOS website.
For additional support, you can email us at support@blockchainbeach.com and we can attempt to connect you with a third party service provider.
Posted from my blog with SteemPress : https://www.blockchainbeach.com/unofficial-eos-token-registration-guide/