Hey I took a villiger kid skin and editted it and I tryed using it in my map but I cant. I made it a blp and used a custom path,though it might be wrong.
DEAR GOD! im a physcic i knew that this topic was about this subject!haha well anyways. you make a vilager child skin you need to type the original path wich for the kid is iether: Units\Critters\VillagerKid\VillagerKid.blp or Units\Critters\VillagerKid1\VillagerKid1.blp these paths may be wrong came from my mind not viewer... next you save the map,quit world editor,reboot it and open up map.it will be replacing teh villager child/kid. hope i helped beter not be a skin like the one described in my sig below you...
To use skins You must first import the skin, by clincking useing the built in tool in World editor.
Now if you are trying to use skins from a model you have downloaded from this stsite simply look at the, "Number of Skins:" information. It will give you the path as skinname.blp or something/skinname.blp or something/something/skinname.blp
in the importer change the path of the imported skin by double clicking it and hitting custom path too, the provided skinname.blp or something/skinname.blp or something/something/skinname.blp
now if your trying to import over an exsisting model in wc3 like arthas you would use that models call for its skin, so... ill get the list of paths but for now use wc3 image viewer and open the model you want and click show paths.