If you'd like to unsubscribe (cancel) your subscription, you'll need to log into your account page. From there, head to the subscriptions tab and scroll to the bottom to find the Manage Subscriptions button as shown here:
Once you've clicked on Manage Subscription, click the Unsubscribe button as shown here:
That's it! Once you've filled out the brief cancellation survey, you'll be unsubscribed from the subscription plan.