That was explained in the first two paragraphs. This contract was designed to be interacted with by their interface. Plus it's really not that complicated.
Anytime
- Fund the contract
- Claim tokens after window has closed.
At any point between now and before ICO is over:
- Generate an EOS Key
- Map the EOS Key
Pretty simple.
RE: EOS Crowdsale with MyEtherWallet - The Complete Guide