I would like to cancel my membership

You can downgrade your subscription back to free plan. Please, take a look at this guide : How-to-Downgrade-Subscription-Back-to-Free-Account

After confirming the subscription cancellation, the subscription wont be auto-renewed anymore.

If you want it to be downgraded immediately please contact us.

Let us know if you need further assistance.

You can proceed as suggested by @metehancet. If you have any troubles please let us know so we can help you.