You can use several ways to create navigation bars in your tiki site.
One easy way to explore some of the possibilities is to apply the profile
Site layout (in Control Panels > Look and Feel) will be set to
Fixed top navbar 1 (uses "top" module zone)
Preference Site logo (feature_sitelogo) will be disabled so that logos and site title are not shown twice
This profile is best demonstrated after applying the
Collaborative Community profile which include site title and topbar module with menus.
Changes in header section:
Full view of page changes: