Hi, I'm Robert and I'll be helping you with your printer question.
are you getting any specific message ?
It may just be broken or it might be jammed
the adf units usually just open up by pulling the top up and towards the outside of the machine.
It is possible that it is also picking something up on the glass or is set to use the flatbed rather than the adf
if i knew what message it was giving you i could narrow it down some.