The organiser will only let you in with the email address you used originally to register so make sure you are putting in the email address that you used when you registered.
Passwords are secure so if you have forgotten your password you need to click HERE and put in your email address. This will send you a random new password. Once you log in with this the first time, make sure you remember to change your password to something more memorable. Don't worry you can do this more than once if you forget your password again.