Some functions to modify Yoast SEO breadcrumbs. (WordPress)

functions-2.php

// Add an element after "Home" to Yoast SEO breadcrumbs. (WordPress)
add_filter( 'wpseo_breadcrumb_links', 'qr_add_breadcrumb' );
function qr_add_breadcrumb( $links ) {
    $breadcrumb[] = array(
        'url' => 'URL',
        'text' => 'Text',
    );
    array_splice( $links, 1, -2, $breadcrumb );
    return $links;
}

functions.php

// Remove "Home" link from Yoast SEO breadcrumbs. (WordPress)
add_filter('wpseo_breadcrumb_links', 'qr_remove_home_breadcrumb');
function qr_remove_home_breadcrumb($links) {
    if ($links[0]['url'] == get_home_url()) { array_shift($links); }
	return $links;
}