First of all open your Internet browser and go to https://blocktrades.us and then, just follow these steps:

Step-1 Select Steem Dollars (you can select any other currency from that list and convert it into BTS, the process is same).

Step-2 Select BitShares (you can also use this method if you want to convert it to another currency, the process is similar, but slightly different).

Step-3 Enter your BTS address / account name. (I have typed mine for demonstration purpose)

Step-4 Select "Get Deposit Address" (then you can either use SteemConnect or Manual Transfer, usually I avoid SteemConnect because I don't want to use my Steemit Account keys to any other third party, but if you think its easier for you then you can go ahead, but here I will show you how to do it manually.

Step-5 Copy The Memo.

Step-6 Open your Steemit Wallet, then go to Steem Dollars and Select Transfer.

Step-7 Once you click on transfer and a new window opens write Hive account@blocktrades in the "To" box just like how its shown on the screenshot.

Step-8 Choose the amount of SBD that you want to convert to BTS, here I'm converting 2 SBD. I suggest you should check out the exchange rate first. The exchange rate fluctuates minute by minute, so it is recommended you wait when the value is high, and do the exchange at the correct time.

Step-9 In the Memo paste that Memo which you copied from #blocktrades website when you were at Step-5.

Step-10 Click submit and then enter your password to confirm the transaction. Within a few seconds your SBD will be converted into BTS and you will have it in your BTS wallet.

That's all.. See how easily you can convert your SBD into BTS.