Username needs to be at least 3 characters, and may contain only English alphabet, numbers and underscores. Password needs to be at least 8 characters.
Your email address will not be shown to other users. Make sure you enter a valid address. You'll need it if you ever forget your password. For a profile picture you'll need an email address associated with Gravatar. Email address can be changed later.
Alternatively, you may sign in using your Twitter account. A Twitter account can also be connected afterwards.
Please note that making multiple accounts in order to boost ratings is forbidden and will result in account termination. If you forget your password, reset it or contact a staff member.