In the Beaver Builder Theme, if you want text to appear in the header layout instead of a logo, you set it in Customize > Header > Header logo and you can enter the text you like.
No matter whether you use text or a logo in the header, you should add a site title and tagline in Customize > Settings > Site identity. This information is important because it appears in search results. The Site title field is good for a business or blog name, while the tagline is good for entering information such as location and a description of your site using keywords that will facilitate search.
Instead of entering the site title and tagline in Customizer, you can go to Settings > General in the WordPress admin panel and enter it there.