Once you have downloaded and signed in to Mendeley Reference Manager, go to Tools > Install Mendeley Cite for Microsoft Word.
This will take you to Microsoft App Source to download the plug-in for Microsoft Word.
From Mendeley Reference Manager, go to Tools > Install Mendeley Web Importer.
This is a browser extension that is available for Firefox or Chrome.
If you are on a managed laptop or University computer, you may not have admin rights to download software.
You can request new software using the Information Services Software Request Form.
If it is difficult for you to download software, you may want to try just using Mendeley Web in the browser, and seeing if that will work for you.
The key things that the downloaded Mendeley Reference Manager software gives you is the ability to use it offline and to export all your references.