HP Color LaserJet Enterprise CM4540 MFP series - Manual (Page 114)

2. Adjust the paper-length and paper-width
guides by squeezing the adjustment latches
and sliding the guides to the size of the paper
being used.
3. Load paper into the tray. Check the paper to
verify the guides lightly touch the stack, but do
not bend it.
94 Chapter 6 Paper and print media ENWW