Sign in to the Customer Portal and click on  'Payment Methods'. 

To Update an Existing Card:

  1. Find the card you would like to update
  2. Click the three dots menu and choose 'Edit'
  3. Update the expiration date or billing address
  4. Click Save Changes

To Add a New Card:

  1. Click the Add a New Card Button
  2. Fill out the required fields
  3. Click 'Save Credit Card'