Make sure the capitalization is correct, as both handle and password are case-sensitive. Also be careful that you are not including any extra spaces before or after your information, particularly if you are pasting the password from the email, as that is wont to happen. If you are sure that you've entered your information properly, and are using the latest version of Firefox, an admin will have to look into this.
____________I dare you to make less sense.
Are you a newbie, or do you have access to newbies?