How do i change my direct deposit bank account

[Kadian]

If the return has already been e-filed, Unfortunately, once you have transmitted your return, you will not be able to make changes to your bank account information through TurboTax. However, if you had chosen the Refund Processing Service you can try going to the Santa Barbara Tax Products Group website for assistance.

If you did not use the Refund Processing Service, you may be able to contact the IRS directly (800-829-1040), after the return has been accepted, and see if they might be able to update your bank account information.

If you aren't successful in getting the bank account information updated, don't worry. If the IRS is unable to deposit your refund amount they will send you a check in the mail.  

If you are still working on your return, follow the instructions given in the below article:

https://ttlc.intuit.com/replies/5619072