The Style Manager displays the currently installed citation styles and the date they were last updated. You can add CSL and EndNote citation styles by clicking the “+” button and locating the style file on your computer, or you can click the “Get additional styles…” link to visit the Zotero Style Repository. To delete a style, select the style and click the “-” button.

Include URLs of paper articles in references – When unchecked, Zotero will only include a URL when citing journal, magazine, and newspaper articles when the article does not have a page range specified.