To change the credit card used, follow these steps:
Navigate to Billing, by clicking your email address in the top right of the app
Note: If you do not see Billing as an option, this means you are not the Account Owner. Only the Account Owner can update billing information.
Next, in the Billing details panel, click Change beside the Payment Method
Next, you'll be presented with the ability to input your new card information.
Lastly, click Confirm. Your new card will be used for all future or past due Mouseflow invoices.