From desktop Mendeley: Click Tools - Install MS Word Plugin
The Mendeley toolbar will install in Word under the References menu.
Put the cursor at the end of your document and click Insert Bibliography from the Mendeley toolbar in Word
15 styles are installed by default (includes APA, Harvard, Chicago and MLA). Other styles can be installed.
• To select a style, use the style window from the Mendeley toolbar in Word OR click View – Citation Styles from the desktop version
• Click More Styles to see a large list of other styles available for installing.
• If you can't find the style you need, is also possible to edit styles to meet your needs: More information