Can't remove or add new/update VISA card

[DoktorVinter]

I get this message when I try to remove my card information. I tried updating (add new) first, but that didn't work, the page wasn't found. No error code, the page just doesn't exist apparently?
I'm trying to update my card info since I got a new card a little while back and haven't used it here yet. So I wonder.. What do I do? Is there an easy-fix or is this customer support stuff? I hate dealing with customer support... :/ And there's no difference between this card and my old one, except for the info on the card. 

[Alwin Alcott]

1 hour ago, DoktorVinter said:

there's no difference between this card and my old one, except for the info on the card.

what card?.. because when it's a debit/prepaid ... those could be working fine in the past, but not now, seems randomly.

btw.. the answer is in the pop up ?