Click on the gear icon and then Company Profile
Click on ADD A NEW CARD
Mark the card you wish to use for billing as your PRIMARY CARD. You can have multiple cards on file. Your primary card will always be used for payments but backup cards will ensure that you do not lose access to your account in the event your primary card cannot be charged.
Set your primary card
The arrows will allow you to set your primary card. The X will delete the card from your account.