These options are available with the browser extension added to your browser.
If you have the PDF of the article opened already, just click the "PDF icon" in the browser bar. The article and its metadata (author, title, and such) will be saved into your library.
If you are on the results list, click the "Folder Icon" in the browser bar. Zotero will then bring up a list of articles present. select the articles you wish to add to your library. The metadata and the article will be added to your library.
