We haven't filed initial returns yet for 2016. Do you mean 2015?
Do you need to amend a 2015 return?
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You file for 2016 after 2016 ends, and you get all your W-2 and other forms: so sometime in Jan or Feb of 2017. A 1040X is filed when you wish to amend a return that's already been filed, accepted and processed by the IRS. It must be filed by mail, and takes about 4 months to process.
A 1040X is an amended return for a prior year you filed. What are you trying to do?
Please review this help resource @LynneVanderMeer. You may review this one @pmp5.