You print and mail the amended tax return.
To access your current or prior year online tax returns sign onto the TurboTax website with the User ID you used to create the account - https://myturbotax.intuit.com/
Scroll down to the bottom of the screen and on the section Your tax returns & documents. Click on the Year and Click on Download/print return (PDF)
IRS website for mailing addresses (Form 1040-X) - https://www.irs.gov/filing/where-to-file-paper-tax-returns-with-or-without-a-payment
