My credit card was comprised, how can I cancel the old and add the new one on this IPAD

Are you trying to change the Credit Card details used to

a) make purchases from your AppleID account for Apps, media and Apple Services

b) change the credit card details used with your Safari browser - using Autofill

c) update your credit card details used for ApplePay

…or a combination of the above?

AppleID, App Store etc.

See >>> Change, add, or remove Apple ID payment methods - Apple Support

Note that if you only have a single credit registered to your account, you must add a new card before the old card details can be deleted.

Safari AutoFill

You can add/delete/edit your credit cards that are registered for AutoFill here:

Settings > Safari > AutoFill > Saved Credit Cards - tap Edit

Wallet & ApplePay

Settings > Wallet & ApplePay > Add Card

Existing Credit Card details can be edited by tapping the existing card entry.

Check this link...

Change, add, or remove Apple ID payment methods - Apple Support