Thanks kcfrau.

Does this mean that the EOS tokens must be off the exchange and in a wallet like MEW so these addresses can be seen in the 'Snapshot'? Or can this all be done on an exchange like Bitfinex?
I know I can generate a public address for my EOS tokens on Bitfinex but I'm not sure about the private key and where to actually register this? On the EOS website somewhere, perhaps?

Sorry about all of the questions! I hope you can help me clarify the above.
Thank you!