Your SELweb username is your email address. SELweb will send an activation link via an email with the subject line "SELweb Account Information" so that you may set up your SELweb account and password.
Please keep an eye out for these emails as they can sometimes go into junk mail. They are often sent the same morning as a scheduled SELweb training.
If you never received or cannot find this email, please contact support@xsel-labs.com so that we may resend the activation link to you.