To avoid jams, never add or remove paper from Tray 1 during printing.
Open Tray 1.
Pull out the tray extension to support the paper.
Load paper in the tray. For information about how to orient the paper, see the product User Guide or support site.
Make sure that the paper fits under the fill line on the paper guides.
Adjust the side guides so that they lightly touch the paper stack, but do not bend it.