Unable to Update Billing Information

My MuseScore Pro subscription renewal is due in 11 days. However, for this to happen, I first need to update my billing information. I am not on Auto Renewal, so this button does not work on my account page. I have carefully reviewed my other account features and the MuseScore website and do not see a link or menu for updating billing information. Days ago I reached out via email to MuseScore support and simply received links to the same web pages I visited earlier. These simply show how to cancel or ask for a refund.

Unless I can update my billing information, my Pro subscription will soon lapse. I'd be grateful for any suggestions on how to rectify this situation. Thanks!