Go to Marketing Store in the main navigation, browse available services, and click Add to Cart on the one you want.
Two ways to pay: credit balance (pre-loaded in My Account > My Wallet, 1 credit = 1 USD) or direct payment by credit card (managed in My Account > Payment Methods). Credits don't expire.
If a purchase fails, check your wallet balance or card status, then retry. Submit a support ticket if neither works.
