-Step 2: Texture Paths
Many people get confused on what paths to use for giving the unit the skin you wish to use, so I'll help out a bit more. First you open up Wc3viewer. Then in the treeview, click on .blp. Afterwards click through until you find the unit you want to skin (hint: sometimes it's found in textures). Once you have found it, look through and see which headings you went through to find that unit (example: units/creeps/medivh/medivh.blp or textures/herodemonhunter.blp). Another thing to remember is to always have the .blp at the end and that if you click on the name and another subcategory pops down, you have to repeat it ( example units/creeps/medivh/medivh.blp). If you need visual aid, heres a picture of what it could look like:
Now that you know the path, in WE, in import manager, rename the path from war3mapImported/(units name here) to the path that you wish depending on the unit. Now save, close, and open it back up. Now the unit should have the skin.