Use Mendeley Cite add-in for Microsoft Word to generate citations and bibliographies, with these key features:
Mendeley Cite is compatible with Microsoft Word 2016 or later on Windows and Mac, Microsoft Online, Microsoft Office 365, and the Microsoft Word app for iPad.
Once the plug-in is installed: Open Word, go to the Reference Tab, Choose Mendeley Cite, and sign into your Mendeley account.
See the Mendeley Cite guide for detailed instruction on using this tool in Microsoft Word.