Template
Hello! CMS uses a very straightforward template system, the website layout is defined in template.html.
Various <div>s are found in template.html which will be replaced by content:
<div class="content"><div class="title"><div class="menu"><div class="submenu"><span class="login">
You probably want to leave the style="display: none;" bit, to prevent the .submenu layer from being visible when a page does not have a submenu.
The login span will be replaced by a single <a href> to login, this usually looks best as a seperate submenu or after the copyright notice.