If you remember the registered email address [one you used to signup], it’s easy to retrieve the login details. Go to client zone login page and click “Request a Password Request”. The instructions to reset the password will be sent to your email.
If you don’t remember anything, even your registered email address, please email your information to firstname.lastname@example.org. As a matter of security, you will need to show some of the account details or proof of payments made.