1. To sync Mendeley desktop with Mendeley web, click on the Sync button in the upper left hand corner of the desktop application.
2. After the sync happens and the green spinny wheel disappears, your Mendeley Desktop library will be synced to your Mendeley web library. Go to the Mendeley website, sign in, and click on Library.
3. Your web library will now contain the same references that are in your desktop library.