Managing your subscriptions is easy:
On your computer, navigate to your profile page using the dropdown menu in the upper-right-hand corner. Once there, click “Settings.” In your Settings, click “Subscriptions.” You should see a list of all your subscriptions and the date you will next be billed for each. Use the “Modify Subscription” and “Edit Payment Information” links to cancel your subscription or change your payment method.
If you purchased your subscription with Google Play or the Apple Store, visit your settings within these app stores to update your payment information.
If you are on a mobile device, tap the avatar icon on the app's tool bar. From here, tap the gear icon and then tap "Subscriptions." From here you can cancel your subscription.