If you need to cancel your subscription, you can do so any time before the expiration of the current plan.
Login to your account, if you haven't already logged in.
From the top left corner of the dashboard, open the account menu with down arrow and click Account Settings.
In Account Settings page go to Subscriptions tab.
Click the Cancel button.
Once a subscription plan is canceled, you will not be billed any further. But you will still be able to enjoy all PRO benefits until the expiration date of your current billing period.