Related posts don't display

Hi,
After installing Yuzo the related posts don’t display. I’ve tried putting this code:
<?php if ( function_exists( “get_yuzo_related_posts” ) ) { get_yuzo_related_posts(); } ?>
into my childtheme at functions.php, but i get a syntax error.
My website is: http://beeldopener.nl

I use the cutomizr theme. Can anyone help me?

Thanx,
Linde

https://ww.wp.xz.cn/plugins/yuzo-related-post/