If you wish to change the credit card on file or see other payment options please to do the following:
Log into your cam4.com account.
Click MY ACCOUNT in the orange bar, upper right of your screen.
Click PAYMENT OPTIONS in the left hand menu.
UNtick the box beside "enable one-click"
This will require you to enter your payment information each time you make a purchase.
You can re-enable the one-click option by following the above steps and checking the box "enable one-click".