Note: Office 2016 for Mac and the Endnote Cite While You Write plugin for Word do not play nicely together. This may result in you not seeing the CWYW tab in your Word 2016 interface. The crux of the problem appears to be that only Endnote X7.5 is compatible with Office 2016 for Mac. For more information on how to install Endnote X7.5 and fix the problem, visit Endnote's help ticket on the issue here.