Make sure you have Zotero Standalone open. You will not see an icon in the toolbar if it is not open.
If the Zotero connector is installed in there will be a folder, paper, or Z icon in your toolbar (icon depends on your browser). If you mouse over the icon you will see the tool tip "Save to Zotero..."
If it is not showing, you may not have installed the connector. Go to zotero.org and download the appropriate connector for your browser.