Hi Feijer
If you’re wanting to add the tagline (in your Site Identity), I was able to do that by editing the header.php file, adding one line of code after the logo call on line #36:
<?php bento_logo(); ?>
<div class=”tagline clear”><?php bloginfo(‘description’); ?></div>
Then you can control the postiion using the .tagline class in css.
If you want something other than your tagline, you can just add text like this:
<?php bento_logo(); ?>
<div class=”header-text clear”>This is the title <span>and subtitle</span>.</div>
Ideally you should create a child theme, as any edits to theme files will be overwriten when updating the theme (https://wordpresschildthemes.com/bento-child-theme/).