HP SmTank 5101 All-In-One Wireless Thermal Inkjet Color Printer - Manual (Page 26)

Load envelopes
1. Raise the input tray.
2. Slide the paper-width guide to the left.
3. Insert one or more envelopes into the far-right side of the input tray, and slide the stack down until it
stops.
The side to be printed on should face up.
20 Chapter 3 Load media