hello kaaimangroep,
I was able to accomplish a search bar using this code in my header.php
<?php get_search_form(); ?>
In order for the search bar to work, you would need to create a search.php file if the theme you’re using does not have it.
Hi, did you set your menu as Primary? Your site address?
I hadn’t set a menu, I only used the automatically generated menu. Adding a menu in Appearance > Menu and setting it primary did the trick.