Simply click the extension icon when on a journal website or database like PubMed – it will work for both individual articles and search results pages. You’ll be able to see the titles of the articles you can import, and for search results pages you can select articles individually or in bulk:
At the bottom of the extension window, you’ll see options to import to an existing Project, or create a new one. In cases where a DOI or PMID is detected the article will be imported with full metadata. If we detect an open access PDF we’ll import it and attach it to the reference automatically. If you're importing from an individual article page where a PDF is available you'll see an option to include the PDF along with the reference metadata: