Your username will be public and visible to anyone, including Google and other search engines, so be sure it is something you are comfortable with others seeing. For privacy reasons, do not use your real name or email address as your username.
Allowable characters: letters, numbers and -_+ (spaces are not permitted)
Email address
Use a valid email address, you'll need to verify it.
Password
Be tricky! Choose a strong password. Include letters (uppercase and lowercase), numbers and punctuation for the most secure password.