As long as you have not yet e-filed your tax return then you can go to the File section of TurboTax and you will see your banking information that transferred in from your prior year(s) return. At that point, you'll be able to Edit or update your banking information for direct deposit before e-filing your return.

For additional information on direct deposit please see the following TurboTax FAQ: https://ttlc.intuit.com/replies/3302459