For sure go to PayPal and find the place in your account that deals with auto-payments. Also, at the bottom of every page is a "Contact Us" link. So maybe also send them a note stating you no longer wish to be a paid member and maybe any pertinent reasons you care to give them.
De-authorizing the future payment in PayPal will be the most assured way to make certain you aren't charged again.
Last edited by Iride01; 01-20-21 at 10:00 AM.