I really can't help with mods and such since I don't play Mordhaus, or even own it, this was one of the last games that I did on request so I really can't help here.
I can only tell you that if you search something you or the paths relative to the paths in the linked page are located in your appdata within the "mordhau" directory
But where to put everything I really can't help since I'm not familiar with the game itself.