You can check - and edit - all of your membership information by going to maximumfun.org/manage and entering the email address associated with your membership in the box. Then, click the "Look me up" button. You should receive an email with a link to a page where you can view and manage your billing info, membership level, listening habits, and mailing address.
If you have trouble, drop us a line at membership@maximumfun.org and we can help you out!