If you haven’t reached your Account Card limit you can add a new Account Card from the Account Cards screen using the 'Add a New Card' panel.
If you have lost your Account Card please visit the Account Card screen, find your lost card in the list of your Account Cards and set the card as lost using the 'Mark as Lost' button. Your card will now be marked as lost and will be unusable. Remember to pick up and register a new card!
If you have vouchers assigned to your account these vouchers are always available to be applied to your purchase at till point (Presuming all voucher requirements are fulfilled). You can also use Auto-Apply to pre-set vouchers in a pending state on a particular account card so that when this card is presented at till the voucher will automatically be applied. Auto apply settings are applied to your Default Card and can be modified within the Vouchers screen.