Advent Touch Print All-in-One Printer Extended User Manual page 28

Handling Paper
3. Move the left and right paper-edge guides for loading envelopes.
4. Insert the envelope(s) with the flap towards the tray and the top of the envelope
against the right side of the tray.
5. Move the paper-edge guides until they touch the envelope(s).
23 adventprintersupport.custhelp.com