Brother MFC-J615W Basic User's Manual page 21

Loading envelopes and postcards
a
Before loading, press the corners and
sides of envelopes or postcards to make
them as flat as possible.
IMPORTANT
If envelopes or postcards are "double-
feeding", put one envelope or postcard in
the paper tray at a time.
b
Put envelopes or postcards in the paper
2
tray with the side to be printed on face
down, and the shortest edge in first as
shown in the illustration. With both
hands, gently press and slide the paper
side guides (1) and paper length
guide (2) to fit the size of the envelopes
or postcards.
Loading paper
2
1
2
13