Someome know how to put the mod DE balance at Custom Scenario. Like that, custom will be more funny

You need to put the custom scenarios in the correct path (scenarios have a .scx file extension)

If you have The Conquerors you need to place them in:

C:\Program Files (x86)\Microsoft Games\Age of Empires II\Voobly Mods\AOC\Data Mods\DE Balance\Scenario

But if you have AoE2 HD you need to go to:

C:\program files (x86)\steam\SteamApps\common\Age2HD\Voobly Mods\AOC\Data Mods\DE Balance\Scenario

Hope it has been helpful.