Your direct deposit information will be at the bottom of your Form 1040.
To view your 1040 after filing, Sign into TurboTax > Taxes > Tax Timeline > Some other things you can do > Download/print (.pdf).
Form 1040 the information regarding your refund is on lines 75-77 and direct deposit is on line 76. a-d).
As long as you haven't filed yet (or you e-filed but got rejected), you can simply step through the File section again to update your bank information.
If you want to change or edit the banking information that is shown,