Ваше имя пользователя; не применяйте в нем знаков пунктуации за исключением точек, знаков переноса и подчеркивания.

A valid e-mail address. All e-mails from the system will be sent to this address. The e-mail address is not made public and will only be used if you wish to receive a new password or wish to receive certain news or notifications by e-mail.