From the YARPP FAQ:
How can I move the related posts display?
If you do not want to show the Related Posts display in its default position (right below the post content), first go to YARPP options and turn off the “automatically display” options in the “website” section. If you would like to instead display it in your sidebar and you have a widget-aware theme, YARPP provides a Related Posts widget which you can add under “Appearance” > “Widgets.”
If you would like to add the Related Posts display elsewhere, edit your relevant theme file (most likely something like single.php) and add the PHP code related_posts(); within The Loop where you want to display the related posts. (Make sure you don’t add echo related_posts(); or you may end up with duplicates in your related posts section.)
Outside of moving it around as a block, to put it inline with your content, you’d have to create your own shortcode. You can create your own shortcode plugin to do something like that or you can have a look at something like EXEC-PHP. If you are going to do this, make sure you take a close look at THIS.
