WP-Star Rating Plugin

so it tells me to do this:
https://www.ads-software.com/extend/plugins/wp-postratings/installation/

Open wp-content/themes/<YOUR THEME NAME>/index.php
You may place it in archive.php, single.php, post.php or page.php also.
Find: <?php while (have_posts()) : the_post(); ?>
Add Anywhere Below It (The Place You Want The Ratings To Show): <?php if(function_exists(‘the_ratings’)) { the_ratings(); } ?>

I’m using thesis 1.8.1 and when i go to wp-content/themes/*thesis_18/index.php it says

[Code moderated as per the Forum Rules. Please use the pastebin]

I went to my custom_fuction.php page but can’t find the line it wants me to have.. any idea??

thanks