Browsers don't allow a page to set itself as your homepage automatically. Follow the steps for your browser below.
Chrome
Edge
Safari
Firefox
Open your browser's settings and look for a Homepage or Startup page option, then paste the file path shown above.
First export your bookmarks from your browser, then select the saved file below.
Chrome
Edge
Safari
Firefox
In your browser's bookmarks manager, look for an Export option and save the file as HTML.