You don't need to claim the token now, but someday in future after end of the ico you need to claim them, because as far as I understood than they will be frozen and converted into real EOS blockchain token.
Keep also in mind, that their is a risk that the EOS Smart Contract could be hacked. What happens in this case, if somebody else claims your EOS token?
RE: Tutorial: How to invest in EOS ICO and claim EOS token using MyEtherWallet.com