The Classes subscription is purchased through the app, at either the Google Play or iTunes stores. You will need to cancel your subscription through the provider, which in this case is either apple or google. Instructions on how to do so can be found here:
Apple: https://support.apple.com/en-us/HT202039
Google: https://support.google.com/googleplay/answer/7018481?hl=en&co=GENIE.Platform%3DAndroid
If you need assistance please click the Support icon at the bottom right of your screen to connect with our support team. You can also call Customer Service at 1-800-526-8442 or email us at cooks@americastestkitchen.com. Our hours are 8 AM to 6 PM CST, Monday to Friday.