If you do not remember your password then you would need to reset your password. Simply go to Password Reset page and enter your email address that you used to register and hit the "Reset My Password" button. You will receive an email that has link and instructions to create your new password.
NOTE: The password that you newly create has certain minimum requirements. It has to include:
Minimum of 10 characters
At least one small letter
At least one capital letter
At least one number