Click the menu button of the application you are using, and then click [Print].
Select the printer you want to use.
Click [Preferences].
In the "Document Size:" list, select the envelope size.
In the "Input Tray:" list, select the bypass tray.
In the "Paper Type:" list, select [Envelope].
Change any other print settings if necessary.
Click [OK].
Start printing from the application's [Print] dialog box.