You can add, edit, or delete a credit card by heading over to your Profile Page after you've signed into your account with your email address.
If you're on a Shave Plan: go to the 'Your Next Box' page, scroll down to 'Subscription Settings,' and click 'Payment Method.' A tab on the right will open. Click 'Add Card' in that tab.
If you're not on a Shave Plan: go to the 'Your Details' tab, scroll down to 'Payment Methods,' and click 'Add Card.'
To remove a card: you can find your cards under 'Payment Methods,' on the 'Your Details' page. Select the card you want to delete and press "Delete Card" in red.
If the card you’d like to delete is the one currently being used for your Shave Plan, you’ll first need to update to a new card on the ‘Your Next Box’ page. Once you’ve added the card you’d like to use going forward, you’ll then be able to delete that old card as explained above.