Canon MG6800 Series Online Manual page 165

3. Holding the right tab on the front cover, pull out the cassette until it stops.
4. Use the right paper guide (A) to slide both paper guides all the way out.
5. Load the envelopes in the center of the cassette 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 cassette.
Up to 5 envelopes can be loaded at once.
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