Do I mail in my return or does Turbo Tax mail it in. I

Only you as the taxpayer can print, sign, date and mail the tax return to the IRS.

You must include with the mailed tax return copies of forms W-2 and/or 1099 which have taxes withheld.

See this TurboTax support FAQ for the procedure to print a tax return for mailing when using the online editions - https://ttlc.intuit.com/community/printing/help/how-do-i-print-and-mail-my-return-in-turbotax-online/01/26258