How do I use the Manual Feed Slot on the HL-L3290CDW?
Use both hands to insert one sheet of paper into the Manual Feed Slot after adjusting the guides, and continue pressing the paper against the rollers for about two seconds until the machine grabs and pulls it in. The Manual Feed Slot supports plain paper, thin paper, recycled paper, bond paper, thick paper, labels, envelopes, and glossy paper. For labels and envelopes, open the back cover (face up output tray) before printing.
From the official Brother HL-L3290CDW Color Laser Printer manual, page 13
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