You can cancel your subscription at any time. Subscriptions are automatically billed according to the period stated upon purchase (monthly/3 monthls/annually). The cancellation steps vary depending on who your subscription is billed through.

Your subscription auto-renews and is managed through iTunes. You can cancel your subscription from your iPhone, iPad, iPod touch, or your computer.

iPhone, iPad, OR iPod TOUCH
• Open Settings, and then tap iTunes & App Store.
• Tap your Apple ID at the top.
• Tap View Apple ID and sign in if prompted.
• Tap Subscriptions.
• Find and tap the subscription you would like to cancel. If you do not see one, check if you signed in with the correct Apple ID.
• Choose Cancel Subscription (iOS 10) or turn off Automatic Renewal.

Computer (Using iTunes)
• Open iTunes and sign in with your Apple ID.
• From the menu bar along the top, choose Account > View My Account.
• Enter your password and choose View Account.
• On the Account Information page, scroll down to the Settings section.
• To the right of Subscriptions, choose Manage.
• Choose your subscription. If you don't see your subscription, make sure that you're signed in with the correct Apple ID.
• Choose Cancel Subscription (iOS 10) or turn off Automatic Renewal.