In order to cancel your Apple subscription you can follow any of this two options:

Option 1:

  1. Access Settings in the home of your device;
  2. Scroll down and tap iTunes Store and AppStore;
  3. Tap your e-mail and Apple ID, View Apple ID and enter your password;
  4. Now, tap Subscription - Manage and select the app that you want to cancel your subscription;
  5. Turn off the auto-renewal option and tap Done.

Option 2:

  1. Enter your device Settings and scroll to find iTunes & App Store.
  2. Tap on your Apple ID:
  3. Tap on View Apple ID.
  4. Scroll to find Subscriptions.
  5. Under "Active" subscriptions, tap on the app that you want to cancel your subscription and Cancel Subscription.