Canon ImageRunner 2545i Reference Manual page 136

3
4
5
Squeeze the lever on the side guide. Without releasing the lever,
slide the side guide leftward or rightward to align it with the mark
for the desired envelope size.
6
Unscrew the front width guide of the envelope feeder attachment.
Grasp the left and right sides of
the paper drawer to pull and lift it
out of the machine.
Remove all the loaded
envelopes.
Side Guide
Lever
Envelope Feeder Attachment-D1
5
5-13