4. Slide the green paper guide to the right until it's flush with the edge of the envelopes, and it snaps into place at the appropriate envelope setting. The envelope guide will pop up to keep the envelopes vertically aligned.
Envelope guide
U.S. No. 10 envelope
European DL envelope
5.Close the paper tray gently until the envelope guide is flush with the envelopes. The paper tray does not close all the way. Don't force it or you may cause a paper jam.
6.Insert the output tray.
An "out of fax paper" error will display on the front panel card of the HP OfficeJet Manager, if it is open. Although the device is unable to detect the presence of envelopes even when properly loaded, it will print them.