HP Color LaserJet 5500 Printer series - Manual (Page 81)

2. Move the tray switch to the Custom size position. Once a custom size is set for a tray, it
will be retained until the switch is moved back to Standard.
3. Slide the paper width guides all the way open and adjust the rear paper-length guide
to the length of the paper being used.
4. Load the paper face-up, making sure that the stack height of the paper does not exceed
the maximum stack height mark in the tray.
EN_WW Configuring input trays 71