You can build your library of citations in a number of ways:
- Drag/drop a PDF into the center pane.
- Select a file/folder from your computer.
- Use the Web Importer to import references from web pages.
- Import from another reference manager or BibTex.
- Add the reference manually.
- Import citations automatically as you add PDFs to a Watch folder.

Note: Remember that Mendeley collects all references added to personal libraries to the Mendeley Web Catalog. If you don't want a reference added to the catalog, check the Unpublished Work box at the bottom of the details pane.