Within 23 hours after the end of the final period on June 1, 2018 at 22:59:59 UTC, all EOS Tokens will become fixed (ie. frozen) and will become non-transferrable on the Ethereum blockchain. At this point the EOS Token distribution will be complete and any person who wishes to launch a public blockchain platform adopting the open source EOS.IO Software (an “EOS Platform”) will be able to generate a file or “snapshot” showing the fixed balances of the EOS Tokens from the state of the Ethereum blockchain (the “Snapshot”). As block.one will not configure and/or launch any EOS Platform, block.one will have no control over when, how or whether the EOS.IO Software is adopted or implemented, or how, when or whether a Snapshot will be created or used or whether an EOS Platform is launched.
In order for the balance of your EOS Tokens to be included in the Snapshot if a Snapshot is created, you must register your Ethereum address with an EOS public key.
Here the Instructions: