After you file

If you did not start the amended return using the amendment process then you will not have a form 1040X in the file ... you must start over again or prepare the form by hand.  All amended returns must be mailed in ... make sure to sign it and use some sort of tracking. 

 

https://ttlc.intuit.com/community/amending/help/how-do-i-amend-my-return-in-the-turbotax-cd-download...