It took me a few minutes to figure out. All you do is go to edit design then you pick a keybored you like and click duplicate・ then go to the duplicated keybored and leave the app and go to settings and do what the tutorial says to do in settings :). Now with the rating, the keyboard is tiny and veryyy hard to use. I think its a cute app idea but it needs an update..
Ratpinkle about Customized skin+Emoji CocoPPa Keyboard