To subscribe, just follow the easy steps below:
Note: Before you can purchase a subscription, you must have a credit/debit card enrolled in your Apple ID.
1) Go to the menu located at the upper right corner of the screen.
2) Tap "Account".
3) Tap "Upgrade" button under subscription.
4) Enter your App Store password then click “Continue”.
5) Tap OK to confirm subscription.
6) Re-enter your password then tap "Buy".
7) Tap "OK" once purchase is completed.
You may encounter some delays when subscribing through iOS/iTunes which may lead to the late posting of your subscription plan.