Add contextual help tabs on any admin page

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<?php

function mqw_example_contextual_help( $contextual_help, $screen_id) {
    
   # Uncomment this to see actual screen
   # echo 'Screen ID = '.$screen_id.'<br />';
     
    switch( $screen_id ) {
        case 'toplevel_page_settings_page' :
     // To add a whole tab group
            get_current_screen()->add_help_tab( array(
            'id'        => 'my-help-tab',
            'title'     => __( 'How to get started?' ),
            'content'   => __( 'Put any text here bla bla bla ....' )
            ) );
            
            break;
        case 'mi_plugin_page' :
            //Just to modify text of first tab
            $contextual_help .= '<p>';
            $contextual_help = __( 'Your text here.' );
            $contextual_help .= '</p>';
            break;
    }
    return $contextual_help;
}
add_filter('contextual_help', 'mqw_example_contextual_help', 10, 2);
?>

Instructions:

Place this on functions.php or in your plugin file. Create as many helps tabs you need by switching the $screen_id.

Uncomment the echo line to see the current page id.

Related links:

http://www.masquewordpress.com/como-anadir-pestanas-de-ayuda-en-themes-o-plugins/