Wordpress - Code Snippet Library not working on my theme

Hi I am working on a new Wordpress blog and it for code tutorials so it's very important to have code snippets in it , I tried many plugins but I comfortable with Code Snippet Library

The issue is it's not working on my custom theme I tried twenty fifteen, twenty fourteen and twenty thirteen and it work great on all of them,

How I know the part in my theme that conflict with the plugin, or what I have to add to my theme to support this plugin.

Sorry for my poor explanation but I am new to Wordpress

via Chebli Mohamed