HP Color Inkjet cp1160 Printer series - Manual (Page 77)

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1. Raise the top of the tray.
2. Slide out both paper guides, then remove all paper from the tray.
3. Place no more than 15 envelopes—with the flap side on the left and
facing up—in the tray.
4. Push the envelopes forward until they stop.
5. Slide the paper guides snugly against the edges of the envelopes.
6. Lower the top of the tray, then pull out the paper tray extension.
preparing to print multiple envelopes