There are a couple ways to do this. I prefer to just create a widget.
In modern theme index.php file add:
<?php
/*
Theme Name: modern
Theme URI:
Description: modern
Version:
Author:
Author URI:
Widgets: header,footer,sidebar,
Theme update URI:
*/
function modern_theme_info() {
return array(
'name' => 'modern'
,'version' => ''
,'description' => 'modern'
,'author_name' => ''
,'author_url' => ''
,'locations' => array('header','sidebar','footer')
);
}
?>
Then place <?php osc_show_widgets('sidebar') ; ?> into the theme main.php at sidebar code wherever you want it to appear. Your image suggests you want to place it at the end of the locations code.
Then go to admin, widgets and create your widget using whatever code (html, php) you want.
Tom