Many plugins don't work like social media, maybe due to theme?

Hi all,

At this site I’m working on adding social media buttons.

Whatever plugin I try, it doesn’t show. Not above posts, not below I also tried a calender plugin, also that doesn’t show in posts. (or anywhere, although as a widget it works)

The template I’m using is called ForChildren (paid version) which comes with it’s own social media settings. When you switch those on, it comes up with an ugly floating box on the left of your screen with text links.

I’m getting the feeling certain code has been removed from posts.php or so, that prevents plugins to work properly.

Is there an easy way to get this fixed? Their support is (too) slow.