You should have already followed the Rendering the admin page contents using HTML recipe and the resulting plugin should still be active in your development site. Alternatively, you can get the resulting code (Chapter 3/ch2-page-header-output/ch2-page-header-output-v5.php) from the downloaded code bundle. You should rename the file ch2-page-header-output-v5.php as ch2-page-header-output.php before starting this recipe.