Step-by-step instructions with pictures
1. On the Home screen, tap Settings.
2. Tap App and iTunes Stores.
3. Tap your Apple ID.
4. Tap View Apple ID. You might need to sign in.
5. Under Subscriptions, tap Manage.*
6. Tap the subscription that you want to manage.
7. Use the options to manage your subscription. You can choose a different subscription period, or turn off Automatic Renewal.
8. Turn off Automatic Renewal to cancel a subscription. Your subscription will stop at the end of the current billing cycle.
The Pro features will remain active until the end of your membership period.