I have paid through apple iTunes, cannot see an option to cancel auto-renewal on the app?

For ITUNES auto-renewal can only be canceled from your iTunes account, whichever you have used while subscribing. Click on the respective mode of your initial subscription below and follow the instructions to cancel the auto-renewal.

Here are the steps:
-Tap your apple ID at the top of the screen.
-Tap View apple ID. You might need to log In or use Touch ID.
-Tap Subscriptions.
-Tap the subscription that you want to manage.
-Use the options to manage your subscription.