For 2016 I forgot to report our LLC and our loss for the LLC. How do I report it for 2016 and 2017?

In 2016, we filed form 1065 but did not report it on our personal taxes. We are a partnership.

Should I first submit an amendment for 2016 before filing the 2017 personal taxes? How do I add the LCC on the 2017 taxes as a business that started in 2016?