Super Mario 3D World + Bowser's Fury Forum  /  Don't propose category extension on this forum!!
  Ender_RunsEnder_Runs
(edited: )

There is a category extension box down level leaderboard, just click it, go to forum and propose the category.

Simple as that. (Sorry for bad English)
CircleGuyCircleGuy likes this. 
  ely_ely_

Or you can also click this link

https://www.speedrun.com/sm3dw_bfce/forum
Ender_RunsEnder_Runs likes this.