how do i update my payment method

The Mozilla Monitor Plus product which was subscription based was shutdown Dec 17 last year. I take it you are actually referring to perhaps '''Mozilla VPN''' ? https://vpn.mozilla.org If so then see https://support.mozilla.org/en-US/kb/how-do-i-update-my-payment-information-mozilla-vpn Mozilla VPN is one of Mozilla's premium products. In order to get premium support from a dedicated agent, please submit your question with your Mozilla VPN app by going to '''Settings''' > '''Help''' > '''Contact Support'''. Alternatively, you can sign in to the Mozilla account connected to your subscription here (if not already) and then use [/questions/new/mozilla-vpn/form this link]. Also the Mozilla VPN form link can also be found at top at Ask a Question > Mozilla VPN.