Zotero downloads automatically as a desktop client. You can also install a browser connector.
1) Go to the Zotero Download page at Zotero.org
2) Download a browser Connector to allow your web browser to save citations to your Zotero library for Chrome, Firefox, or Safari.
Each browser has its own version of the Zotero connector, so if you use multiple browsers, you'll need to install it separately for each browser.
Zotero lets you save references from most library catalogs (including USC's) and databases, with one click.
If Zotero detects that you're looking at a book or article on a catalog, database, or other compatible site, you'll see a book or page icon appear in the utility bar of your browser.
Click the icon, and Zotero will automatically save the citation to your library. If you'd like to see additional options for saving, click the arrow next to the icon.
After clicking the Zotero icon, you'll see it save to your library in the bottom right hand corner of your browser window.
Zotero can't automatically capture citation info from some web pages, but you can still add them to your Zotero library.
Click the Zotero button to access Zotero's controls and expand the Zotero pane. Click the page button (to the right of the green plus sign) to save a link to the page. This will save a new "web page" item to your library. You can add information about the author, etc., if you wish.
It's easy to create a bibliography from your Zotero library.
Select the references or collections you want to include. Hold the control key and click to select multiple items. Right-click one of the selected items and choose Create Bibliography.
Choose the bibliographic style you want, select Copy to Clipboard, click OK and paste into your word processor.
Zotero offers word processing plugins for Word and OpenOffice. The plugin adds a Zotero toolbar to your word processor that allows you to add citations to your document while you write.
To add a citation, click the first button ("Insert Citation") on the toolbar. Search for the reference you want to cite and press Enter. Zotero will add the citation at your cursor.
At the end of your paper, click the third button ("Insert Bibliography"). Your bibliography will appear, and new citations will be added automatically. Change bibliographic styles with the last button on the toolbar ("Set Doc Prefs").