Invite code: We're currently invite only.
Username: Required. 150 characters or fewer. Letters, digits and @/./+/-/_ only.
Last name: Optional.
Password: Your password can't be too similar to your other personal information.Your password must contain at least 8 characters.Your password can't be a commonly used password.Your password can't be entirely numeric.
Password confirmation: Enter the same password as before, for verification.