Click the image above, and:
1. Download the Zotero application
2. Install a connector for your browser.
Scroll down on the Zotero download page to install browser connectors (this allows Zotero to identify citations and add them to your account) for Chrome, Firefox, and Safari. Zotero does not work in Internet Explorer (IE).
Zotero (pronounced "zoh-TAIR-oh") is an application that helps researchers manage their citations by storing, organizing and formatting information sources. It's easy to use, connects with your web browser to download sources, and best of all it's free.
Zotero allows you to attach PDFs, notes and images to your citations, organize them into collections for different projects, and create bibliographies.
This video will show you how to get started.