Log in using with the ID and password we sent after you registered--the ID should be something like "AB123X". User names are case sensitive (and usually uppercase)!
If you have forgotten your ID or your password, you can reset your password by going to the Password Reset Page and handing over your email address. The system will then email you your username and a link to reset your password.
PLEASE do this rather than making a new registration or emailing the staff if at all possible. The former will mean you will possibly get dates with people you have seen before, the latter will negatively impact an already overworked technical support division.