Also if you don't know the username and maybe the email you set it up with in forgot password when you enter your email it will send you a email with the username of the account. or if you dont know the email you used to set it up with you are best with waiting for a staff team member to assist...
Do you remember the username of it? if so hit forgot password in the bottom right of sign in and you will need to enter your email and it will send you a password reset link. Then just enter your new password with the username. hope this helps.