IBM S544-5343-03 - Manual (Page 46)

3. Press down on the bottom plate of the paper tray until it snaps into position.
4. Important! If you are not changing paper size, go to Step 5 on page 27. If you
are inserting longer paper, do the following:
a. Push in on the size lock button and slide guide A out.
26 Network Printer 17: User’s Guide