This is the most labor-intensive way to enter references into EndNote Basic, and it is the most prone to errors.
Search external databases from within EndNote Basic. For topic searches, it is recommend searching PubMed via the PubMed website. Search options from within EndNote Basic are limited.
This 3-minute tutorial will show you how to manually enter references into your EndNote Basic library.
You can attach a PDF (or other file) to a reference in EndNote Basic.