iOS app, and a card expiring soon

I have the iphone iOS app, and a card attached that is expiring soon. I cannot work out how to replace the card, update the card or remove the expiring card to add the new card.

Unfortunately the current UI requires you to have a second card added - you can then remove the first card and re-add it with the new details. It’s not a great system unfortunately but is a known issue - you can vote on the need for improvement here: Ability to update details when underlying card is about to expire