Assign players for multiplayer skirmish

[unmateria]

Hi there :) I had been trying thing to make a map working in multiplayer skirmish. I made it work for combat, but no way to assign players in skirmish. I want to make a 4 players VS the computer. Has anyone any idea? I have watched a ton of youtube videos, and digging all forums etc, but I didnt find the way.

Thanks in advance! :)