The app didn’t work – Poke Skins for Minecraft - Pixelmon Edition Skins Review

Item: Poke Skins for Minecraft - Pixelmon Edition Skins
Rating: 3
Author: Farmer John 24

Can somebody tell me how to do this I need help
Review by Farmer John 24 on Poke Skins for Minecraft - Pixelmon Edition Skins.