How do I print on envelopes with my product?

• You can load up to 10 envelopes at a time, flap edge left and printable side up.
  Place them against the right edge of the sheet feeder, then pinch the left edge guide and slide it against the envelopes (but not too tightly).
  
  Tip: For best results, press each envelope flat before loading it, or load one envelope at a time.
  
  
  The printable side should be up, and the flap side should be down and on the left. Slide the left edge guide against them.
  
  Move the thickness lever on the side of the printer to the envelope position. (Remember to move the thickness lever back to the normal position when you're done.)