Soledad theme

Hello,

I’m using the Soledad theme and I can’t add the code for the breadcrumb trail.

/**
* Use the following code in your theme template files to display breadcrumbs:
*/
<?php if (function_exists(‘rank_math_the_breadcrumbs’)) rank_math_the_breadcrumbs(); ?>

I don’t have single.php or header.php on my child theme, only functions.php and style.css

Can you help me?
Thanks in advance