If you own EOS or eosDAC ERC20 tokens, you need to register your Ethereum address with an EOS public address to receive the coins on the EOS network.
Two easy guides for registering your EOS before the launch of the EOS Mainnet:
Register your EOS tokens using the Ledger Nano S : https://www.youtube.com/watch?time_continue=6&v=gPq9rHdj_5o
Register your EOS tokens using Exodus wallet (register for free token airdrops) : https://www.youtube.com/watch?v=PXp_L252xGs
When the EOS main net launches next month, the ERC20 tokens held in the registered Ethereum address will be credited on your EOS address.
Youtube links where published in a steem post : https://steemit.com/eos/@crypt0/important-register-your-eos-tokens-here-are-my-two-tutorials-ledger-and-exodus-both-easy-methods
And this awsome guide can help a lot: https://bitcoinist.com/june-1-almost-register-eos-eosdac-tokens-lose-forever/