If you never actually filed the return and did not complete the forms you will need to mail the tax return to the IRS, please see this TurboTax FAQ for more information:
https://ttlc.intuit.com/community/using-turbotax/help/how-do-i-prepare-a-prior-year-tax-return/00/25....
If you did file your tax return but it had been rejected by the IRS you will need to print the return and attach all necessary W2's or 1099's etc and mail it: https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-access-my-prior-year-return/00/270....
See this for the mailing address for the IRS: https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment.
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