1 - Find the company or contact you want to add the credit card to by searching in the bar at the top.
2 - Go to the 'Credit Card' tab.
3 - Select 'Edit Contact'.
4 - Select 'Add Credit Card'.
5 - Enter a Nickname for the card to help you identify it in future.
6 - Fill out the remaining details.
7 - The address of the contact/company will be carried through automatically, but can still be edited.
8 - Select 'Finish'.
9 - The credit card will now be added to the contact or company, depending which one you had searched for and selected at the start.