Place plugin content after page content

On your pro site plugin, we can set which page will display the subscription content but unfortunately the pro site plugin shows part of its content before and some after my page content (see pictures below). I'd like all the plugin content to follow my own.

See this link for a live example: https://www.mannydesigns.com/wordpress/

Which file contains the code (and which line if huge) that sets your content before the post content?