You can update your payment method at any time from within your online account. You cannot make this change from within the Butternut App currently.

From the 'Home' page, head to the your profile icon:

Click on 'Payment methods'

Select 'Add Payment Method'

Choose 'Credit/Debit Card'.

You will then be asked to enter your card details. (Please note, ticking 'Make this the default payment method' will ensure the new card will be used for future payments)