LaserWriter 8500: Selecting Envelope Cassette

My LaserWriter 8500 User Guide instructs me to select an envelope cassette in the print dialog box and to set it to installed and preferred. I do not see a choice for this in my printer setup or print dialog box. What do I do?
The manual is misleading in its intention. To be certain that the optional feeder is recognized in the printer setup, and to specify this feeder when printing envelopes you have to install the optional sheet feeder and the envelope cassette.

You do not have to have an optional feeder to use the envelope cassette on the LaserWriter 8500. All of the cassettes work in both the optional and built-in feeder of the printer. If you are using the envelope cassette in the built-in feeder, simply specify cassette (standard) in the print dialog box. Otherwise, specify which optional cassette feeder to pull from or allow the printer to pull from the proper source automatically.
Published Date: Feb 18, 2012