I put in a new credit card.  How do I switch the payment and erase the old one?

How do I add a new credit card to pay for my annual subscription?  The web page likes my Visa and encourages me to change the expiry date on the now expired card.  But I want to switch to my Mastercard.  There doesn't seem to be a way to add a new card for payment.

 

How do I change from profile from GB to Canada?  I have moved countries and need to change my credit card information.  My new credit card has not been excepted as the country for billing is not the correct country.