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What do you mean?

Current EOS tokens will not exist (or will not be worth anything) 48 hours after the launch of the EOS blockchain (June 18 I think). They are an ERC20 token which represents the token on the EOS blockchain.
You need to register your ethereum address with EOS to ensure you are credited with the EOS when the block chain goes live.

This article explains how to do it:

https://steemit.com/eos/@sandwich/contributing-to-eos-token-sale-with-myetherwallet-and-contract-inner-workings

Whoa! Thank you!

Hey so clarify for me so it clicks in my brain :) If I go out to say open ledger and buy $500 worth of EOS before June 18th they'll essentially be worth nothing and a waste of time and money? So wait to buy till after or buy and register them?

I don’t know about different wallets or exchanges but my understanding is that if you hold eos on an ethereum address after the go live date, it will effectively be worthless unless you register it.

OK thanks for that.

The current EOS token is only a placeholder for your real EOS tokens when the platform launches in june 2018. Registering your tokens on the Ethereum platform allows them to swap you 1:1 for the real EOS token. They can't give you the real tokens if they can't find you. Hence, registering your tokens on the Ethereum platform is a must.