The information that you provide is needed so that we can be sure that it is you when you return. That will allow you to modify any of the profile information that you provide to us at a later time. The email address is only required for notifications generated by this identity provider and for recovery if you lose access to your account. The "UserName" must be unique for this site and will be used as a display name on web pages and emails only. If left blank the email address will be used.