How do I cancel my membership?
- Open the Settings app on your device. 
- Tap your name. 
- Select 'Subscriptions'. If you don't see this, tap 'iTunes & App Store', then tap your Apple ID, tap 'View Apple ID', sign in, scroll down and tap 'Subscriptions'. 
- Tap your Supporting Membership subscription 
- Tap 'Cancel Subscription'. 
If you no longer have access to your iOS device anymore, you can cancel your subscription on a different device. Read more in this article from Apple
To cancel your Supporting Membership on Android
- Open the Google Play Store on your device, 
- Click the three horizontal lines in top left corner (Menu), then choose 'Subscriptions', 
- Select your Supporting Membership subscription. 
- Tap 'Cancel Subscription'. 
If you no longer have access to your Android device anymore, you can cancel your subscription on a different device. Read more in this article from Google.
