If you would like to cancel your subscription, please click on the Account button displayed at the upper right hand side of your window and click on Account.
Next scroll down to the section called Danger Zone, and click the arrow to open up the box. Once it is open, click the Cancel Subscription button and your subscription will not renew.
You will still have access to your subscription until the expiration date. After the expiration date, your account will revert back to the Standard (Free) plan.