Es ist immer noch html und css. Also so wie früher.
Für eine statische Navigation kannst du folgendes machen.
Suche in der "/includes/themes/"Dein Template"/index.php nach
<!-- Navigation Modul -->
<div id="navigation_modul">
<?php #echo get_navigation_modul();?>
</div>
<!-- Navigation Modul END-->
und ersetzte es mit
<!-- Navigation Modul -->
<div id="navigation_modul">
<!--<?php #echo get_navigation_modul();?>-->
<nav class="navbar navbar-expand-lg navbar-light bg-light">
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNav" aria-controls="navbarNav" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNav">
<ul class="navbar-nav mx-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<a href="#"><img class="float-left bg-primary img-fluid" style="max-width:100%;height: 75px;" src="../includes/themes/default/images/logo.png"></a>
<li class="nav-item">
<a class="nav-link" href="#">Pricing</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
</div>
</nav>
</div>
<!-- Navigation Modul END-->
dann den css Code in die /includes/themes/"Dein Template"/css/stylesheet.css
.navbar .navbar-nav .nav-link {
color: #000000;
font-size: 1.1em;
}
.navbar .navbar-nav .nav-link:hover{
color: #808080;
}
.navbar-logo-centered .navbar-nav .nav-link{
padding: .5em 1em;
}