You put your passport in first, then the kiosk takes your finger print and a picture. Afterwards it asks you if your flight info is correct (or you have to enter it if for some rare reason it won't find it). Then you have to answer the 'customs' questions by marking it on the screen and it prints out your slip.

It is all menu driven and usually just a check mark on a yes or no on the touchscreen.

It pretty much is self explanatory and displays you each step including which way to put the passport in.