Hi,
You will have to install and enable child theme first then via FTP go to wp-content/themes/kleo/page-parts/ and copy the posts-related.php to child theme in the same path folder will miss in child theme and you will have to create it.
So the path in child theme will be : wp-content/themes/kleo-child/page-parts/posts-related.php, then edit this file from child and in the screenshot you will see where to change from random to modified.
Cheers
R
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