save as plugin.headstuff.php and put it under fp-plugins/headstuff/, then enable via plugin panel
<?php /* Plugin Name: HeadStuff Plugin URI: http://www.flatpress.org/ Description: Adds some HTML to your <head> section Author: NoWhereMan Version: 1.0 Author URI: http://www.nowhereland.it/ */ function plugin_headstuff_head() { echo <<<HEADSTUFF <|!REG3XP0!> <!-- put whatever html tag you want here! --> |> HEADSTUFF; } add_action('wp_head', 'plugin_headstuff_head'); ?>