To add a new Credit/Debit Card Type:
  1. Click Management
  2. Click System Defined Fields
  3. Click Credit/Debit Card
  4. Below the Add Value heading, fill in the name and description (optional) of the card type
  5. Click Add Value
  6. Repeat steps 4 and 5 until you've added all of the card types you'd like to include 
  7. Click Save and Finish

To disable a Credit/Debit Card Type:
  1. Click Management
  2. Click System Defined Fields Click Credit/Debit Card
  3. Click the Enabled link below the name of the card (this will disable the value)
  4. Click Save and Finish