Use this TurboTax website to access and edit your credit card on file for the TurboTax account - https://shopping.turbotax.intuit.com/unified/downloads?route=myaccounts&cgcview=billing
See this TurboTax support FAQ for updating an Advantage account - https://ttlc.intuit.com/community/choosing-a-product/help/how-do-i-update-or-confirm-the-info-in-my-...
