How do I load and print envelopes on the HP LaserJet Pro M203?

Load envelopes face-up with the short, postage end leading into the printer in either the Priority input tray or the Main input tray (both hold up to 10 envelopes). In the print driver, select the Paper/Quality tab, choose the correct envelope size, set the Paper type to Envelope, and set the Paper source to Manual feed.