You mean what? Saving from World Editor? If you created new map, save it in "xxx\Warcraft III\Maps\", or any subdirectory of this folder, to see your map in Warcraft.
Just save them in W3 map folder (or any its subdirectory). If you don't know where you installed Warcraft, look at desktop or menu start W3 shortcut propeties and there is what you are lookin for.