6. Gently lift the end paper guide to move it, and insert the pins at the bottom of the guide in the holes (indicated by the 
mark) corresponding to the paper size that you want to load.
Make sure that the end guide is properly inserted into the holes for the paper size.
Look
Only a small amount of movement of the end paper guide can make automatic paper size detection impossible. If this occurs, move the end paper guide all the way to its outermost position again, then realign it with the appropriate paper size mark.
7. Align the four corners of the paper stack and insert the paper (print side up) under the tab.
Look
Do not use paper that is folded, creased, or heavily warped. Make sure that all the paper is under the tab.
Do not overload the paper tray.
8. Align the side guides with the edges of the paper.
Look
Pushing the paper guides too hard against the edges of the paper stack can cause a paper jam. However, if the paper guides are too loose, the paper may twist as it feeds through the printer.