If you subscribed on the website, to cancel start by:
1. Log in to your account
2. Go to the upper right corner and click on the profile icon and a second click on your name for opening the Account Settings menu.
3. Select My Purchases to see and manage your subscription. Simply click the Cancel Subscription button for canceling your subscription.
If your subscription is made through the App store, it is possible to unsubscribe through GooglePlay/ iTunes as they are the ones who charge you and to whom you provided the payment details.
For quick support access the following: