Oh boy, registration. The good news: registration is free, the bad: it is mandatory, as You are a game developer

If You have been registered on any of the play portals like or You can rather go to the login page and upgrade Your account there, again free of charge
This can be Your email address, but maybe better to have an individual id, as this might come up in statistics on our site and visible to other game developers
This is the name others will see You in games. Use something cool!
We'll never share your email with anyone else. You will receive an email to confirm Your address and to finish registration.
Make it a secure one, as this allows You to get access to Your funds and game related assets.