byf_header_url.css

#title a {
    background: url(http://rossoncpa.com/blog/wp-content/uploads/2016/10/rosson-logo.jpg) no-repeat !important;
    background-position: center !important;
    background-size: contain !important;
    float: left;
    min-height: 80px;
    width: 100%;
}

byf_header_url.php

//* Logo URL
function d4tw_logo_url( $title, $inside, $wrap ) {
	$inside = sprintf( '<a href="%s" title="%s"></a>', esc_url( 'http://www.mainpagehere.com' ), esc_attr( get_bloginfo( 'name' ) ), get_bloginfo( 'name' ) );
	$title = sprintf( '<%s id="title">%s</%s>', $wrap, $inside, $wrap );
	return $title;
}
add_filter( 'genesis_seo_title', 'd4tw_logo_url', 10, 3 );

//* Remove the site description
remove_action( 'genesis_site_description', 'genesis_seo_site_description' );