To be able to see the file tab after you have selected a method of filing an online return, you will need to open your return back up. To get your return open in TurboTax online, select "add a state" under the Some things you can do menu. This will not add a state, but will open your return back up so you can access the tabs.
To change your filing method:
https://ttlc.intuit.com/replies/3985787
