HP Deskjet 6122 Color Inkjet Printer - Manual (Page 68)

6. Replace 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.
My computer runs Mac OS 8.6 or 9.x
—or—
I am using a Mac OS 9.x application on a Mac
OS X computer
Mac OS 8.6, 9.x, and X Classic
I am using an application built for Mac OS X Mac OS X
printing envelopes with Mac OS 8.6, 9.x, and X Classic
1. Open the Page Setup dialog box, then select the following settings:
panel setting
Page Attributes
Page Size: Appropriate envelope size
Orientation: Appropriate envelope orientation
2. Click OK .
3. Open the Print dialog box, then select the following settings:
5. Slide the paper guides firmly against the edges of the envelopes.