First step:  read the shortcode API reference in WordPress Codex. I had a difficult time figuring out exactly where to place the “add_shortcode” function call.

Second step:  Place the “add_shortcode(‘shortcut name’, ‘shortcut function’);” to the same place you put your add_action and add_filter calls — I’m basing this off the excellent tutorial I found — “How to Write a WordPress Plug-in“:

//add actions
add_action('admin_menu', 'DevloungePluginSeries_ap');
add_action('wp_head', array(&$dl_pluginSeries, 'addHeaderCode'), 1);
add_action('activate_devlounge-plugin-series/devlounge-plugin-series.php',  array(&$dl_pluginSeries, 'init'));

//Filters
add_filter('the_content', array(&$dl_pluginSeries, 'addContent'),1);
add_filter('get_comment_author', array(&$dl_pluginSeries, 'authorUpperCase'));

//Shortcodes
add_shortcode('shortcodename', array(&$dl_pluginSeries, 'function'));

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