Are you referring to an Advantage account (annual membership subscription)? If so, see the steps outlined in this FAQ on cancelling an Advantage subscription and removing the credit card info:
https://ttlc.intuit.com/community/downgrading/help/how-do-i-cancel-my-turbotax-advantage-subscriptio...
Or are you referring to the shipping/billing section of a regular TurboTax account?
