A week ago you asked how to do FBA. I gave you this advice:

Go to Seller U and study everything in there for the next month or two.

You are NOT ready to even think about selling on Amazon if you are asking that basic of a question.

Amazon is NOT for people that are not self sufficient and willing to learn their system. It takes HOURS of work to be ready to sell on here.

THAT advice still holds but here is the step by step information that YOU could have found on Amazon if you had bothered looking:

Here are the steps on the Amazon "help" board for fixing the issue IF you have a valid card to use:

Update your credit card information

If you have received an error message about your credit card, it is important to update your credit card information as soon as possible.

Check the below information related to your credit card:

Is the credit card valid?

Is there a minimum charge amount?

Are you using a pre-paid card? (Note: Use of a pre-paid card is not accepted for a selling account.)

Does the bank have a record of the charge attempt?

Are there bank limits or policies that prevent the charge attempt from being authorized?

Is there any incorrect credit card information entered? (Note: All the credit card information entered such as number, name, address, ZIP code, or expiration date must be an exact match with your card details.)

Is this chargeable in the currency of the Amazon marketplace where you registered your seller account?

Until the card verification problem is resolved, Amazon won't be able to process any payments for your account.

Note: Only the primary account owner can make changes related to payment information.