How can I get a copy of my signed and final tax return?

If you e-filed your tax return then it was electronically signed using the 2016 AGI or your self-selected 5 digit PIN.  There is no physical signature on the tax return.

To access your current or prior year tax returns sign onto the TurboTax website with the userID you used to create the account - https://myturbotax.intuit.com/

Scroll down to the bottom of the screen and on the section Your tax returns & documents click on Show.  Click on the Year and Click on Download/print return (PDF)

If you need to give someone a signed copy you can print it out and sign it with ink.

The current online PDF of the 2017 tax return may not be the final return if you changed it after filing ... they  will not be available for a few weeks while the online editions are in transition from 2017 to 2018.  This happens every tax year during the transition from one tax year to the next.  Check back weekly to see if the final return is included in the PDF download.