You should have already followed the Creating an administration page menu item in the Settings menu 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-v4.php) from the downloaded code bundle. You should rename the file ch2-page-header-output-v4.php as ch2-page-header-output.php before starting this recipe.