Tabbed Menu on 1.8?

I wanted to ask if anyone knew what to do, to get Tabbed Menu to work on Mybb version 1.8? :yus:because I am clueless and can't seem to find any answer anywhere that I look. :noh:

People say the 1.6 plugin works, you just need to change the compatibility to 18*, but I would rather do it myself than have a plugin. You can find my tutorial here: https://nulledbb.com/Thread-Category-Tabs