P.S. my website is: https://www.iknowit.it
I found out i gone wrong with the functions and I need to change the alx_blog_title() in functions.php.
So i changed this function part of code:
$subheading = esc_attr( ot_get_option('blog-subheading') );
in this one:
$subheading = "<marquee behavior='scroll'>".esc_attr( ot_get_option('blog-subheading') )."</marquee>";
And now i have the subheading scroll but one line under the heading and not next to it. Is that an issue about the CSS?