1) Go to::
plugins/system/jat3/base-themes/default/blocks/header.php file
and add this:
<?php if ($this->countModules(‘belowmenu’)) : ?>
<div class=”belowmenu”>
<jdoc:include type=”modules” name=”belowmenu” style=”xhtml” /></div>
<?php endif; ?>
below first reference of this code to be seen::
<?php $this->genBlockBegin ($block) ?>
2) Add this at end of template.css file::
.belowmenu{position:relative;}
3) You can follow this thread and add in belowmenu in position text field
http://www.joomlart.com/forums/topic/how-to-create-a-new-module-position/
Hope this helps 🙂
Cheers