Download both the Mendeley Reference Manager and Mendeley Cite before you start. (You need both).
In ONESearch, click on the title of the article you want. In the record that comes up, look for the "Mendeley" button:
The first time, it may ask your permission to export. After that, it should automatically export into Mendeley.
To find it in Mendeley, open the Reference Manager. Select "Recently Added." You'll see your article!
Setting Citation Style
Open Word.
On the top bar, choose References, and the new Mendeley Cite button (on the far right):
Click on "Citation Settings" and then "Change Citation style."
Search for the citation style you need. Choose it, and you're good to go!
How to Cite in Word:
Open Mendeley Cite tool, as explained directly above.
Search for and click on the appropriate Reference. Click the button at the bottom to insert the citation:
Adding your Bibliography:
Click on the three dots in Mendeley Cite, and choose Bibliography.