You complete your tax return by finishing all 3 Steps in the File section. In Step 3, to e-file your tax return, you must click on the Orange "Transmit my returns now" button.
Once you file, you can check your e-file status using the TurboTax E-File Status Lookup Tool. E-file Tool
You will also receive an email advising you of the return being accepted or rejected. If you opted in for text messages, you will receive that also.