The first thing to do is to use the Albert E's guidance to cancel the renewal. You need to log-in on the My Details page, then scroll down. If by any means this procedure doesn't stop the charges from your credit card, then I recommend contacting the bank insurer of your credit card/account. They will block the payments automatically. Secondly, get in touch with the developers of the website and inform them you want to cancel the membership status and the automated charges.
Contact email: help@jacquielawson.com