HP Deskjet 3820 Color Inkjet Printer - Manual (Page 32)

3. Push the envelopes forward until they stop.
4. Slide the paper guide firmly against the edges of the envelopes.
5. Lower the Out tray.
printing the envelopes
If your software program includes an envelope-printing feature, follow the
instructions provided with the software program. Otherwise, follow the
instructions below.
1. Open the Printer Properties dialog box, then select the following settings:
tab setting
Setup
Paper Type: Plain Paper
Paper Size: Appropriate envelope size
Features
Orientation: Appropriate envelope
orientation
2. Select any other desired print settings.
3. After you have selected the print settings, click OK .
For a description of available print options, see print settings .