TurboTax does not mail in your return. Any returns needing to be mailed must be printed and mailed by you. Don't forget to sign the return.
Did you e-file your original Federal return? If you did not e-file your Federal return, you should be able to e-file it now.
Can I change from mail in tax return to e-file?
https://ffa.lc.intuit.com/questions/1798473-can-i-change-from-mail-in-tax-return-to-e-file
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If you amended your Federal return on a 1040X form, you must print and mail it in, and sign the form, & included any forms or schedules that changed due to the amendment.
If you've closed out of your amended return, you can still view and print a copy. It is highly recommend you save a copy for your own records in case you need it again in the future.
Detailed Instructions:
Log in to your account.
Click on Amend (change) return.
Click on the Amend using TurboTax Online button.
Select the My Account drop down in the upper right and choose Print Center.
Under the Choose your option: section, select which forms you want to print.
Click Print save or preview this year’s return.
Click View or Print.
Mail to the address specified in your return.
Note: Be sure you sign out of your account for your own security.
