Brother HL-8050N - Manual (Page 50)

USABLE PAPER TYPES AND PRINTING METHOD 2 - 17
2
Remove the lid of the tray.
3
If the base plate of the paper tray is raised, push it down.
4
Squeeze the length guide and slide it to fit the envelopes.
5
Squeeze the right width guide and slide it to fit the
envelopes.