Zotero Standalone - runs as a separate application and plugs into your choice of browser
Zotero Support & Documentation
Create a Zotero Account - allows you to sync your library, participate in groups, or post to the support forums.
ZoteroBib - Fast, free citation generator
Zotero is a free, easy-to-use tool to help you collect, organize, cite, share, and analyze your research sources. It lives right where you do your work—in the web browser itself. An extension is added to your browser and interacts seamlessly with online resources: when it senses you are viewing a book, article, or other object on the web, it can automatically extract and save complete references.
Go to: https://www.zotero.org/download/
Click on the Download button
Save the file to your computer and run the setup program
Install Zotero Connector (Chrome connector recommended)
https://www.zotero.org/download/connectors
Register for Online Account
https://www.zotero.org/user/register/