In order to change your credit card information please follow this steps:
1.Go to https://languagecloud.sdl.com/translation-toolkit/administration
2.Under Billing Details tab
3.Credit Card Details accordion
4. Add a Credit Card
5. Delete Credit card* - the grey trash can
In order to be allowed to delete/remove your credit card you must not have an active subscription that allows for extra usage.
Once the subscription is expired and you do not have any extra usage to be charged for you can remove your credit card from your Language Cloud account.