Please remember that passwords and usernames are case sensitive - make sure the Caps Lock key is not on by mistake. If you still cant login, you could try to reset your password. You'll receive a confirmation and an email with a new password in the next few minuts. If you don't receive an email then check your junk box please.
If you forgot your email address, then write a support ticket. We will help you as soon as possible. You only need your email adress to open a support ticket.
Important note: Multiaccounts are not allowed.