Your LLC information is on your Schedule K-1, that is generated when you prepare Form 1065, U.S. Return of Partnership Income - Internal Revenue ...
Yes, first amend your 2016 personal income tax and add your 2017 Form 1065 (Schedule K-1) - Internal Revenue Service Partner’s Share of Income, Deductions, Credits, etc. The information for your LLC will transfer to your 2017 personal income tax return and you also may have carryover amounts. See How do I amend a 2016 return in TurboTax? and Where do I enter a K-1 that I received?
If you need to amend a tax return for another year, see How to amend (change or correct) a return you already filed?
[Edited 3-16-2020|8:24 am PST]
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