Kodak 5.1 - Manual (Page 46)

Handling Paper
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Loading envelopes
The paper input tray capacity is 20 envelopes.
IMPORTANT: Do not load envelopes with cutout or clear windows.
1. Lift the paper output tray.
2. Remove any paper from the paper input tray.
3. Move the left paper-edge guide to the far left.
4. Insert the envelope(s) with the flap up and against the right side of the tray.
5. Move the envelopes forward until they stop.
6. Move the left paper-edge guide until it touches the envelope(s).
left paper-edge guide