Select “Manage direct debit”.
Tap the grey “Change” button next to your bank account details.
There will be a pop-up at the bottom of the screen where you can select a new credit card or new bank account. Tap on the one you want to change.
This will take you to a screen where you can update your bank or credit card details.
Enter the new details and press the red “Save” button.
Your payment method is now changed.