When you first sign in to Mendeley online you will be presented with your account home screen. Click on Library at the top right, to view your Mendeley Library.
Web library
Mendeley Web gives you options to manage your own reference library and groups online.
On the left side, find folders (collections) for organising your references, and options for adding new references.
In the central pane is where you will see your references listed.
Click on any reference to see the details for that reference displayed in a window to the right.
At the top, right corner is a search box which allows you to search for references within your library.