You can add files to Mendeley by:
Export references directly from other Elsevier products such as Science Direct or Scopus to Mendeley by:
Manual entry of a bibliographic reference can be completed in both the Mendeley Desktop and Web versions.
You can edit PDFs that have been added to your Mendeley Library. You can do this by double clicking to open the file in a seperate tab within Mendeley Desktop. You now have the option to: