How do I add items to Endnote Web?
Try the easy option first by using the Capture tool. Install the Capture Reference Tool from the Endnote Downloads menu to automatically import references into your EndNote library. You can use the Capture Reference button as well as EndNote Capture toolbars for Internet Explorer or Firefox.
Endnote does not capture PDFs so if you want to save PDFs with your bibliographic data you must download them and them use the paperclip icon under the title of your Endnote entry to upload the PDF.
Some database work well with the capture tool, e.g. Sage Journals, but for other databases you must find the option to Export to Endnote Web. You can also manually enter items easily.