After you setup your controller, press start, then UI settings, at the very bottom there is an option to select Skin. for now you can only use the ones included.
Hi
ok maybe I was not clear about what I meant 
I want to change skin in Kodi, and need to know which Link / commad I need to start Emulationstation in Kodi..
In the original skin, the link is in the shut down menu, but if you want it in the main menu ( in a new skin in Kodi ) you need to know the link to the startup script...
T-J@Y