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If you need to change your credit card information on an Advantage subscription then follow the procedure in this TurboTax support FAQ - https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-update-or-confirm-the-info-in-my-turbotax-advantage-account/01/25883
If you need to change the credit card information for a TurboTax online account then follow this procedure -
Sign onto your TurboTax online account - https://myturbotax.intuit.com/
At the bottom left of the web page click on Intuit Account
On the following screen scroll down and click on TurboTax CD/Download billing and shipping info
On the following screen for PAYMENT INFO click on Edit
Change your credit card information and click on Save