Canon TS9500 Series Online Manual page 113

3. Open the feed slot cover (C).
4. Slide right paper guide (D) to open both paper guides.
5. Load envelopes in portrait orientation WITH PRINT SIDE FACING UP.
Up to 10 envelopes can be loaded at once.
Fold flap of the envelope and load the envelope in portrait orientation with the address side facing up.
6. Slide right paper guide (D) 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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