Alert browser source in OBS is the sixth stop. The alert source pulls live alerts (new follower, new subscriber, tip, raid, host) from your alert service (StreamElements or Streamlabs) into your stream as overlays.

The setup: sign up for StreamElements or Streamlabs (covered in the Stream Overlay course), navigate to your alert dashboard, configure the alert templates (or use the defaults to start), and copy the widget URL provided. In OBS, with your Live scene selected, click the plus icon under Sources, select Browser, paste the URL, set the width and height to match the widget's intended dimensions (1920x1080 typically), and click OK.

The test step: most alert services include a "Test Alert" button in their dashboard. Click it. Watch your OBS preview window. The alert should appear with the correct animation, audio, and text. If it does not, debug the URL or audio routing before going live.

The result: new followers, subs, and other supporter actions trigger visible celebrations during your stream automatically.