You have to go through all three steps of the FILE section -- Choose how you are paying your fees, make sure to choose how to receive your refund if you are getting a refund-- and the last thing you do is click a big orange button that says "Transmit my returns now."
HOW TO CHANGE OR ENTER BANKING INFORMATION FOR REFUND
You cannot change banking information while your return is in pending, nor can you change it after the return is accepted. The IRS does not allow it.
DID YOU E-FILE?
Did you e-file? Did you go through all three steps of the FILE section and click a big orange button that said “Transmit my returns now?”
When you e-file your return you will get two emails from TurboTax. The first one will say your return has been transmitted; the second one will tell you the IRS has accepted or rejected your federal e-file. If you filed a state return, there will be a third email (usually a day or two later) that tells you if the state e-file was accepted or rejected.
Check your e-file status:
https://turbotax.intuit.com/tax-tools/efile-status-lookup/