The Cite While You Write plugin is a small program that can be installed on your computer/laptop. It places a new "Endnote" tab into MS Word that allows you to do your referencing. The Cite While You Write plugin connects to your Endnote Online account and allows you to insert your citations as you write your work/research in MS Word.
For information on how to use it, take a look at the Cite While You Write Quick Start Guide, located under the "Referencing" section of this webpage.