Here are the steps to recovering your Training Source account username:

1. Go to the Forgotten Password page.
2. Enter your Email address in the second field marked "Look up your Username - enter your Email Address."
3. A list of any and all usernames associated with your account will appear in a red box on the same page where you entered your email address.
4. (optional) If you wish to reset your password, too, then you can click on your username of choice and a password reset email will be sent to you.