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On the download page, select the Mendeley Desktop program appropriate for your operating system (Mac, Windows, or Linux).
You'll need to create an online Mendeley account. Click Create account (top right corner), and follow the prompts. The free account gives you two gb of cloud space, the ability to create one private group with a maximum of three users. Paid options allow you to increase those limits.
Once you have your account set up, you can edit your profile to share additional details about yourself with colleagues you connect to through Mendeley. You can also mark publications in your library for which you are the author, and Mendeley will track page view, reader and download statistics on those articles for you.
After desktop installation, you'll be asked to login to begin using the Mendeley desktop program.
Under Tools in the Mendeley desktop program, install the Web Importer and the MS Word Plugin (if you use Microsoft Word).