If you are unable to e-file your return, you will need to print, sign and mail the return(s) yourself. TurboTax does not submit mailed returns. I suggest that you mail the return using a certified method so that you're assured of delivery to the IRS. See the TurboTax FAQ below for full instructions on choosing to File by Mail.
"How do I print and mail my TurboTax return?"
https://ttlc.intuit.com/replies/3401713
*** I am NOT a tax expert. I am a seasoned TurboTax user, and volunteer to provide assistance to TT users. Nothing I post is to be considered TAX ADVICE; I bear no legal liability for responses.***