Under the tab “format” on the endnote web site click on “Cite While You Write™ Plug-In” to download the integration app with MS word
Then select the Plug-In that match your operating system
For MAC users: if you face an error after installing the plug-in follow the below steps:-
Go to Microsoft Word and select Tools > Templates and Add-Ins…
Then make sure that the Endnote Web CWYW Commands.dot and Endnote CWYW Word 2011.bundle are checked: