IF you are not going to e-file your tax return then you have to print, sign, date and mail the tax return to the IRS.
TurboTax cannot and does not mail a tax return for you.
See this TurboTax support FAQ for printing a tax return for mailing - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online...
