Hello John Doe, here’s how to set it up:

1. Click the extension icon in your browser’s toolbar (top-right corner).
2. A popup window will appear.
3. Enter your Gemini API key (required).
4. Optionally, add a custom instruction to make summaries follow your preferred style
5. Save your settings.

Once saved, the extension will use your API key and style preferences whenever it generates YouTube video summaries.