You are able to manage your subscription, including cancellation, by clicking on your profile and then selecting Manage subscription.
If you cancel, you will retain access to your account until the end of your current billing period. By canceling during your current billing period, you will not be charged for the next billing period.
Apple App Store subscriptions
If you signed up via the Apple App Store, you need to cancel your membership via the App store. To do so, you can follow these instructions: https://support.apple.com/en-gb/118428
Google Play Store (Android) Subscriptions
To cancel Android / Play Store subscriptions please follow the instructions here: