If you are unable to sign in the first time after you join it is likely that there was a duplicate username issue with the username you chose. If you type in a username that was used on the site by someone else, or a username for an account you previously had but weren't logged into, our system will automatically add a string of numbers to the end of the duplicate username to create a unique username. So instead of your username being harrypotter, it shows up in your welcome email from us as harrypotter83916.
Check your email for a welcome email from the site you joined. It will show your correct username to log in with. If the username on your welcome email does not match the username on your billing receipt (Epoch, Rocketgate) you must use the username on your welcome email to login with, as that's the one in our system.
Look for an email from the site you signed up with and use the info in the email to login:
If you can't find your welcome email, check this article here before contacting us, it'll save you time and frustration: I didn't receive my welcome email