Canon PIXMA MG5500 series Online Manual page 119

(1) Open the front tray gently.
(2) Hold the right tab on the front tray to pull out the feeder until it stops.
(3) Use the right paper guide
(4) Load the envelopes in the center of the feeder WITH THE ADDRESS
SIDE FACING DOWN.
The folded flap of the envelope will be faced up on the left side.
(B) Rear side
(C) Address side
Push the envelopes all the way to the back of the feeder.
Up to 5 envelopes can be loaded at once.
(A) to slide both paper guides all the way out.
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