You can cancel your subscription at any time in your account settings.
1 - Click on your account email address (Bottom left) and click "Account".
2 - Click on "Plan & Billing"
3 - Click on "Manage Subscription"
4 - You will be redirected to the subscription management page, where you can check and review all your subscription details. To cancel your subscription, click on "No, I want to cancel"
5 - You will be redirected to the feedback page, you can select the appropriate option and then click "Cancel My Subscription"
6 - Once completed you will receive a notification as shown below. You will also see the period end date when your account will be downgraded back to the Free plan.