Hi,
The logo by default uses your sites URL this is standard across all WordPress themes and the reason why there is no option to change the logo link.
If you’re using the BB Theme you will need to edit the layout you’re using file via a child theme. These files can be found in the /includes/ folder.
For example, if you’re using the Nav Right header layout, you will want to copy the nav-right.php file to your child theme’s /includes/ directory. By default, the BB Theme child has no includes folder so you will need to create one.
Once created, open that file in a code editor and replace <?php echo esc_url( home_url( '/' ) ); ?> in the a tag to your preferred link.
<a href="<?php echo esc_url( home_url( '/' ) ); ?>" itemprop="url"><?php FLTheme::logo(); ?></a>
Save the changes and your logo image should use that link.