3.Load a stack of paper in the center of the tray with the short edge first and the printable surface facing up. Pinch the knob and the paper guide together and slide them against the right side of the stack for a snug fit.
Note:
When loading paper, do not exceed the maximum stack height marker inside the paper guide.
4. Close the MP tray cover.
Note:
After loading paper, press the 
Setup button on the control panel, press the
rbutton to select Printer Settings, press the d button to select Tray Menu, and match the MP Tray Size and MP Type settings to the loaded paper size.
8 Handling Paper and Originals