You can cancel your subscription by following the steps below:

1. Launch 'Settings' app >> iTunes & App Store.
2. Tap on your Apple ID. 
3. Choose View Apple ID when the popup window appears >> Enter your Apple ID password or fingerprint ID when prompted. 
4. Choose Subscriptions >> KineMaster >> Cancel Subscription. 

Note: Uninstalling KineMaster will not cancel your subscription. In case you uninstall KineMaster but don't cancel your subscription, you will still be charged for the monthly/annual subscription— you must actively unsubscribe following the process above.

For more information, please visit the following site:

https://support.apple.com/en-us/HT202039