8-6 Oki B6100 User Guide
Installing the Envelope Feeder
5.Push the envelope feeder all the way into the printer until it stops, making sure it is seated firmly inside the printer.
NOTE: The printer automatically recognizes an option after the option is installed. The printer driver does not. You must enable (activate) the option in the printer driver after the option is installed.
The steps you will follow vary according to both your operating system and your installed printer driver. Here are the general steps you will follow.
Select the driver you want to work with.
Locate the printer properties section within the printer driver. Use the pulldown window to select the option.
Activate the option.