You can cancel the subscription of monthly membership products under your Apple / Google Account Settings.

If you cancel your subscription, the perks will continue until the subscription period ends.

Once the perks expire, the subscription will not automatically renew. Please refer to the following to cancel your subscription.

 - Google Play Store: [Open Google Play Store app] - [Tap the ≡ menu] - [Subscriptions]

 - App Store: 

[Settings] - [Username] - [Subscriptions] - [Show subscriptions]

[App Store] - [Username] - [Profile icon on top right] - [Subscriptions] - [Show subscriptions]

* The pathways provided may differ based on the device and OS version you are on.