You can cancel your subscription on the store where you paid. Here's how to cancel your subscription by store.
• If you paid on Google Play:
Play Store App - Select top right profile button - Payment & Subscriptions
• If you paid on the Apple app store:
Settings - Apple ID - Subscriptions
• If you paid on the Amazon app store:
Amazon App Store - Select My Apps from the bottom menu - Subscriptions
[Additional Notice]
You can continue to use the service during the month of cancellation, and your subscription will end on the next month's renewal date. Deleting the app does not automatically cancel your subscription.
You must unsubscribe from the store (Google Play / Apple app store / Amazon app store) where you paid for the subscription.