HP Color LaserJet Enterprise CM4540 MFP series - Manual (Page 113)

4. Close the tray.
5. The control panel shows the tray’s paper type
and size. If the configuration is not correct,
follow the instructions on the control panel to
change the size or type.
Load Tray 2 and optional Trays 3, 4, and 5 with custom-size paper
1. Open the tray.
ENWW Load paper trays 93