There are many categories in NPCMOD (different skin use different models, and model errors cause the skin to be unable to display normally). Here
1. Download the skin and put it on the desktop (easy to find)
2. Open the zip/jar file that you want to import (all files of NPCMOD in that zip/jar file) specific path: Minecraft folder /.minecraft/mods installed with Minecraft
3. Use compressed file program (360, good pressure, etc.) to open the jar/zip file of NPCMOD
4. Copy all the skin you want to import, and then put all the skin files in it according to this path
Assets/Customnpcs/Textures/Entity/Humanmale
Of course, you can also add other skin, but it is difficult to find other skin
Let me list you assets/Customnpcs/Textures/Entity, the skin type of all folders in the folder folder, and then you can create a category by yourself (important: All files can be used in Chinese and other languages !!! Alphabetics are used in letters!Just with numbers) Put the skin you want to add into 1 classification. Note that the skin name should be used .PNG to be used .PNG
Note: The MOD version of this tutorial is 1.7.10D other versions of other versions have not been tested.
You don't need to add it deliberately. After you put your skin into the classification, it will automatically add it. It is recommended to check it after putting the skin 1