Canon PIXMA G600 Series Online Manual page 63

6. 6. Load envelopes in portrait orientation WITH PRINT SIDE FACING UP.
Up to 10 envelopes can be loaded at once.
After loading envelopes on the rear tray, the paper information registration screen for the rear tray
appears on the LCD.
Fold flap of the envelope and load the envelope in portrait orientation with the address side facing up.
7. 7. Slide right paper guide to align with both sides of envelopes.
Do not slide the paper guides too hard against the envelopes. The envelopes may not be fed properly.
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