Recover your User Name:
Go to this link here, and enter the email address you may have used to register your business in SAM. If you forget your email try every single email address that could have possibly been used. Once you click submit, you will receive a confirmation email with your user name.
Recover Your Password:
Go here if you remember your email address and user name, but have forgotten your password. This link will send you a email and direct you to an area to reset your password on your SAM Registration.