EndNote can attempt to find a journal article in PDF and attach it to a bibliographic reference that you have saved in your library. Mark one or more references in your library and select References → Find Full Text.
The following settings can increase the success rate for finding the full text documents when you are off campus: select Edit → Preferences → Find Full Text. Enter the following links:
If the PDF is not found and attached automatically, you can add it manually in EndNote:
If you have PDF files of journal articles on your computer, you can import these into EndNote and, in many cases, EndNote will create bibliographic references in your library at the same time:
Sometimes, the PDF will be imported, but without a bibliographic reference. Since you cannot use a PDF to cite the source in a document you will need to create a bibliographic reference. You can mark the PDF and fill all needed information about the reference.