Answer: 

If you are a Billing admin you can update your billing information by doing the following:

  1. From your Billing screen, click Update Account button to trigger the Billing Information overlay.
  2. Enter in any new billing details (address, email, etc.)
  3. Select your desired billing type (default is credit card, invoice available by request)
  4. If changing credit cards, just type in the new card information and hit SAVE. Divvy will automatically deactivate your previous card and use the new card for your next payment.