Important reminder: uninstalling the app will not cancel your subscription.

To cancel, please follow these steps:

iOS users:
Go to Settings > [your name] > iTunes & App Store.
Tap your Apple ID at the top of the screen, then tap View Apple ID. You might need to sign in with your Apple ID.
Scroll to Subscriptions, then tap it.
Tap the subscription that you want to manage.
Use the options to manage your subscription.
 
Android users:
On your Android phone or tablet, open the Google Play Store.
Check if you’re signed in to the correct Google Account.
Tap Menu – Subscriptions.
Select the subscription you want to cancel.
Tap Cancel subscription.
Follow the instructions.