Purchase Ad Credits form can be used to purchase ad credits which can then be spent under Manage Advertisements .
The Quantity dropdown specifies the number of credits one wants to purchase at what price.
The Card Number field should be filled in with a valid credit card.
The CVC field you should put the three or four digit card verification number for your card.
The Expiration dropdown is used to set your cards expiration date.
The Purchase button is used to complete the purchase of Ad credit.
Beneath the Purchase form is the list of Ad Credit Transactions that have been made with your account.