To create a new account, enter your desired username and a valid email address. Usernames must be between three and sixteen characters long.
The email address will be used to send your initial password to you, and re-sending it to you in the event you ever forget it. Users will also be able to send private messages to this address (but that doesn't mean they will see your address unless you give it to them). If you want other users to be able to see your address you will have to specify this on the profile edit page once the account is created.