By default, your subscriptions will auto-renew unless turned off at least 24 hours before the auto-renewal is due.
- Go to Settings > iTunes & App Store.
- Tap your Apple ID at the top of the screen.
- Tap View Apple ID. You might need to sign in or use Touch ID.
- Tap Subscriptions.
- Tap the subscription that you want to manage.
- Use the options to manage your subscription.