karca
You can load megamenu there but it will require customization in style also. Hope below steps can help you:
1/Go to file: ROOT/templates/ja_mono/tpls/default.php
Add this snippet of code:
<div class="t3-navbar">
<jdoc:include type="<?php echo $this->getParam('navigation_type', 'megamenu') ?>" name="<?php echo $this->getParam('mm_type', 'mainmenu') ?>" />
</div>
into the block-right of this default layout, it will look like this:
2/ Customize the style for the menu: this will take time, you can play around with it or hire a dev to customize for you.
Regards