Since you have already Efiled:
- Log in to your TurboTax Online account
- Click on My TurboTax at the top of the page
- Click on My Tax Timeline
- Under Some Things You Can Do (below your 2016 return statuses), click on Add a State (you will not prepare a state return, this just gets you back into the return to download your amended return)
- Once you are in your return click on My Account
- Click on Print Center to view/print/download the amended return and filing instructions
Here's more info on How to Amend.
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