How do you delete a credit card off your xbox 360?

Ok so on xbox live i have my moms credit card but now since i got my own credit card i added it and want to delete my moms credit card off my xbox. How do i do that?|||You can probably change it your personal settings or something like that|||if you go and hit the center button on the controller then on one of the slides go to your profile and edit the info then go to the billing and i should let you delete it from there or sign in on xbox.com and go to profile edit profile billing options credit cards and delete|||ive had to do this before go to xbox.com/accounts and billing