You should have already followed the Processing and storing plugin configuration data 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-v6.php) from the downloaded code bundle. You should rename the file ch2-page-header-output-v6.php to ch2-page-header-output.php before starting this recipe.