Log into the Mongoose Dashboard.
Choose your account and go to "Manage Campaigns"
At the top of the screen, choose the "Account Details" dropdown, and "Profile"
Click on the "View CC Accounts on File" hyperlink
You will see the current card that is on file. Before you can add a new one or update the information you will need to delete the current card on file.
Click on "Add Credit Card" to enter the new credit card information.
Fill in your credit card information and click on the "Submit" button to complete the process.