I have installed the Jetpack plugin and Fashionista theme. So, I think I have the solution for you (and please forget about that topic link I gave you before, and change everything back if you have changed anything):
first go to your plugin settings, scroll to the bottom and un-tick the box next to "Auto Insert Related Posts" and click the 'Save' button. Then go to the tab 'Appearance'-'Editor', select your theme in the upper-right corner ("fashionistas" theme), and find the single.php file. In it, copy & paste the following code: <?php wp_related_posts()?> just below the
<!-- .author-info --></div> code. Please chech this screenshot for easier navigation.
Click the 'Update File' button, go to your blog post, refresh the site and let me know how it went! I'm eager to find out!
All the best,