If your password or username isn't working for some reason, you can recover it at the password recovery page. That page is located at https://www.myICLUB.com/recover. This feature will simply email you a new password once you answer your security question.
If your password isn't working AND you changed your email address such that the email stored on the site isn't current, you will need to contact an officer of your club, or ICLUBcentral support (1-877-334-2582) so that your email address can be changed to the current one. Once this is done, you'll be able to use the password recovery feature located at https://www.myICLUB.com/recover.