Top bar navigation in Header navigation?

Yes, you can add the search option to the header.
First you need to create a child theme – http://codex.ww.wp.xz.cn/Child_Themes

Then put the header.php file in it and activate it.

After that you can add the search option using this code: <?php get_search_form(); ?>

You can put it wherever you want. If you want to appear on the right you can add:

<div style="float:right">
<?php get_search_form(); ?>
</div>

under

<?php if ( !ot_get_option('site-description') ): ?><p class="site-description"><?php bloginfo( 'description' ); ?></p><?php endif; ?>

You may only need to polish the styles a little.

Great! 🙂 Do you mean the search box?

You can add this to your child css file:

.themeform.searchform div input { padding-left: 26px; line-height: 20px; width:300px;}

Super! 🙂