Epson Expression 636 User Manual page 48

3. Locate the two screws at the back of the scanner and slide
the slots on the automatic document feeder forward
underneath these two screws. (Do not remove the
protective materials from the automatic document feeder's
mounting hardware yet.)
4. Insert the two screws provided with the automatic
document feeder into the holes in the scanner as shown
below, and then tighten the screws with a coin.
3-14 Options