How can i set my menu in "Horizental way"? - Joomla! Forum - community, help and support

hello,
i have download , instal succesfull template:
http://crosstec.de/.sub-templatedemos/

above can see menu in horizental way.

on website menu set in vertical way (see attachment).

now question, can change code , in item can change it?

the code need change code in bold:
<nav id="navigation">
<div id="mainmenu">
<div class="moduletable_menu">
<h3>main menu</h3>
<ul class="menu">
<li class="item-435 current active">
<a href="/index.php/nl/">home</a>
</li>
<li class="item-473">
<li class="item-474">
<li class="item-475">
<li class="item-476">
</ul>
</div>
</div>
</nav>

the code need change to: "<div class="moduletable_menu ct_menu_horizontal">"

i hope can me in wich item can change code on joomla / ftp server / database sql changed every page of website.

reviewed demo site , looks have publish menu module module position mainnav.