@Johan: First it is not recommended to modify any core theme files directly as all these files will be reverted back to original when you update the theme. If you want to edit any of these template files then you can build child theme and do it. For child theme, check this http://catchthemes.com/blog/create-child-theme-wordpress/
Then copy content.php in your child theme and then add the following code, just above </article><!-- .post-article -->
code:
<?php if(function_exists('the_ratings')) { the_ratings(); } ?>
Then for single post, you need to copy the whole function simplecatch_content()
from simplecatch_fucntions.php file. Then add the following code, just above comments_template();
code
if(function_exists('the_ratings')) { the_ratings(); }