You may use a pre-paid card, but there are steps that you will need to follow before attempting to place an order.
Please contact the issuer in order to register the card (call Visa, Amex, etc.) with your name and a billing address.
Once it is registered, please check to ensure the billing address you entered in your customer profile matches the billing address on your card account. The card will not process if these addresses do not validate, and this will cause your transaction to be declined.
If the order is declined, then the authorization will sit on the card for 3-8 business days until it processes as a failed order and will fall off the account. This is when you will see the funds return to your available pre-paid balance.