The personal code you got from whoever invited you.
The name you want to be called on this site. At least 5 characters, no spaces. E.g. "Nemo-the-fish" or "Hubei"
The password for your account. At least 10 characters.
Control how much information about yourself is visible to others. You don't have to state your geographic location or share your email-address if you don't want to. All you have to do is to pick an available Callsign.
There is currently no way to recover a lost password, so please keep it safe.