Becky, in that notice, if you click "already registered" it will take you to your registration and you can change or cancel it. Also, from the web site, if you go to your member profile (login and then click your name in the upper right corner), you will see an "Events" tab, that will show you all of the events that you have signed up for. You can then select the one of interest and update or cancel it. Also, in the registration confirmation email and reminder email there is a link back to your registration that allows cancelation. Hope this helps, let me know if you have any other questions.