Manual credit card charge or Updating your customers card
Do you have your customers card number and wanting to charge the card for them? Or maybe your customer needs to update their card on file but isn't savy enough to do it via the payment management screen and instead has given you the card number.
To do this first make sure there is an invoice with a payment due via credit card. Next to that invoice you'll see a red link that reads "change".
Select the red link and a screen will pop up to put in a new credit card.