To put skin on a unit you have to Import it to editor and change it's pathe there like that
Before Edit:warcraft3imported/footman.blp After Edit:Units/Human/Footman/Footman.blp
if you using skin on downloaded model put skin ito fored with model and if it's posible change name of skin to name of Texture that model is using like
Downloaded:Fighter.blp Model Textures Name:Orc_Fighter.blp After Change Downloaded skin name shoul be same as Model Texture
I think you now what im talking about I hope you have learned how to import skin
and if you can't find Path of skin ask people who submit skin for it that's all BYE