HP Color LaserJet Enterprise CP4525 Printer series - Manual (Page 109)

Load Tray 2 with 10 x 15 cm (4 x 6 in) size paper
1. Open the tray.
2. Adjust the paper-length and paper-width
guides by squeezing the adjustment latches
and adjusting the guides to the fully opened
position.
3. Fit the HP postcard media insert into Tray 2 and
then slide the insert to the right until it snaps
into place.
ENWW Load paper trays 95