Dell 1125 Multifunctional Laser Printer - Manual (Page 39)

5. Replace the paper tray cover.
6. Set the paper type and size. See Setting the Paper Type and Setting the Paper Size .
To load paper smaller than the standard paper size(e.g. Envelopes):
1. Insert the paper stack into the paper tray with the side to be printed on facing down.
2. Adjust the paper width guide and move it towards the stack of paper until it lightly touches the side of the stack.
3. Replace the paper tray cover.
4. Set the paper type and size. See Setting the Paper Type and Setting the Paper Size .
NOTE: Improper adjustment of paper guides can result in paper jams.