I like it but there is a problem – Animal Addons Free for Minecraft PE Review

Well the app works but I don’t know how to get on the world to do all the things that are there is because I tried to go on a new world and see if they were in there like one of the animals that I wanted but no so I don’t know how to play please help me
Review by Lorinjax on Animal Addons Free for Minecraft PE.