Hey, no problem, I'll gladly elaborate!
Since you'll be making these changes in your theme editor (under the tab 'Appearance'-'Editor'), those won't be overridden after you'll update our plugin.
First, go to your plugin settings and un-tick the box next to "Auto Insert Related Posts". After that, go under the tab 'Appearance'-'Editor', select your theme and click on the single.php file to make the changes described below:
<?php the_content(); ?>
<span class="nopin"><?php wp_related_posts()?></span>
Enter that code after your post content, click the 'Save' button and you're done! Let me know how it goes or if you have any more questions — I'm here to help!
Take care & have a nice day!