MyBB Community Forums

I keep on search about how to do this but I can't find it.
I'm also afraid of doing experiment because it might ruin my site.

Problem: How to add UserTitle "{$post['usertitle']}" in top posters under Mod "Top Stats"
Mod link: https://community.mybb.com/thread-162423.html

Current Display:


What I want to achieve:

I wonder what specific files I should edit and what codes I should add, please help.