Zotero is free software for your computer. You will need to download both Zotero Standalone and the Zotero browser extension for your browser of choice.
Test if Zotero is working:
Zotero has three panels:
You can also reorder the middle and right panes for a vertical (rather than horizontal) layout. Choose either "Standard" or "Stacked" layout under Preferences > General.
Most settings can be adjusted in Zotero's Preferences:
Recommended settings to review:
If Zotero is not working, please follow these steps: