You can put HTML/JS/PHP right into "Style & Edit HEADER AREA" -> "Configure Header Area"
HTML Code:
<ul id="mymenu">
<li><a href="...">...</a></li>
<li><a href="...">...</a></li>
<li><a href="...">...</a></li>
<li><a href="...">...</a></li>
</ul>
%pages %logo %bar1 %image %bar2
Then style the menu through "HTML/CSS Inserts" -> "CSS Inserts"
HTML Code:
ul#mymenu { ... }
ul#mymenu li { ... }
ul#mymenu li a { ... }