Hi Carl,
You need to add items to the menu elements in the Geeklog Admin Configuration.
These Menu elements are what also appears on the search bar.
You can manually change just the mobile menu by updating the header.thtml Look for:
Text Formatted Code
<div id="offcanvas" class="uk-offcanvas" itemscope="itemscope" itemtype="http://schema.org/SiteNavigationElement">
<div class="uk-offcanvas-bar">
<ul class="uk-nav uk-nav-offcanvas">
{menu_elements}
</ul>
</div>
</div>
and then add the appropriate menu items you want for example:
Text Formatted Code
<li class="menuitem" itemprop="name"><a href="https://www.geeklog.net/polls/index.php" itemprop="url">Polls</a></li>
One of the Geeklog Core Developers.