OK, then, you just need to update your credit card information.
First sign in to your Amazon.com account.
Then go to
(or maybe it is "My Account Settings")
(or maybe it is "Account Settings")
(and one place says it is 'Your Account' ??)
and then go to Add a Credit or Debit Card
and enter the new card.
Then when that's done, go to
Manage Payment Methods,
to delete the credit card there, the old credit card that is.
I seem to recall that removing the old credit card first is not advisable, or is hard to do, or leads to extra work, so add the new card first, then remove the old card after that.
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