Problem with credit card transaction?!?

[July Fourth]

I have buyed tokens with visa credit card of my friend and now i can't delete his credit card from my facebook ( Top Eleven be a Football Manager) problem is in that what if he have some problem with missing money on his credit card he will blame me and what than?? So please help me to delete that. His credit card automaticlly autofill when i want to buy tokens again.
Thanks everybody for any help!

You need to go to payment options on your facebook account

Account Settings -> Payments -> Payment Methods - Manage -> Enter FB Password -> Then Remove Credit Card.