If you are not e-filing then print the return to mail.  It will print with instructions for mailing including the addresses to use for federal and state returns.  You need to attach your W-2's and any 1099's that show tax withheld.

https://ttlc.intuit.com/questions/1944348-how-do-i-print-and-mail-my-return-in-turbotax-online

And of course, you cannot print until your TurboTax fees are paid.

Use a mailing service that will track it, such as UPS or certified mail so you will know the IRS and/or your state received the return.

Is there some reason why you are not e-filing the tax return so that you would not have to print and mail anything?

1. Select File in the left-hand menu (expand your browser window if you don't see this, or go to the hamburger menu in the top left corner).
2. On the Just one more step screen, follow steps 1 and 2 if you haven't already.
3. Select the Start button to the right of Step 3.
4. On the Let's get ready to e-file screen, select I want to e-file.
5. Follow the instructions to e-file your return.