How to manage my subscription when it's purchased with Apple Store?

If you would like to cancel a subscription purchased through the Apple Store, please follow the steps below:

1. First, make sure you're signed in to the correct Apple ID account.
2. Go to Settings, tap Passwords & Accounts.
3. Search for Accounts and tap iCloud, then tap Subscriptions.
4. Tap DoFasting subscription, then tap Cancel Subscription and then Confirm.