For security purposes, only your station has access to your membership information and billing.
Because memberships are retained at a local level, you must email or call your local station in order to cancel your membership. Most stations have a way to update your information or contact them at their website, so we suggest looking at your local station's website for more information. You can also use the below link to find contact information for your station to email or call them with.
If your station sent you an email confirmation thanking you for your gift, this email also should have had information on how to contact your station.