Modifying the subscription
If you decide to change your plan, go to Settings > Subscription, and click Modify subscription button:
On the next screen you can Add products to make more use of your subscription and change your subscription Plan.
How can I cancel my subscription?
If you wish to Cancel subscription navigate to Settings > Subscription and click Cancel subscription link. Window asking you for cancellation reason will be displayed. Please fill it out, we'd love to hear what's on your mind and improve through your feedback.
Once the subscription is cancelled, you will see the information when will subscription terminate. Once it does, you will move back to the Basic plan.