I need to print an amended Red return to mail it in to the IRS

If you completed an amended tax return using the TurboTax online editions for 2018 then download the PDF of the tax return and print, sign, date and mail the amended tax return to the IRS.

Note - If the amended return is not included in the PDF download then you will need to wait until the 2019 online editions become available in December 2019 before the amended return plus all the worksheets for the 2018 tax return are included in the PDF download.

You can file an amended return for a tax refund for up to three years from the original due date of the tax return.

To access your current or prior year online tax returns sign onto the TurboTax website with the userID 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 Show.  Click on the Year and Click on Download/print return (PDF)