Epson B 310N - Manual (Page 48)

Basic Printing 48
8. Select Print Settings from the pop-up menu.
9. Select Envelope as the Media Type setting.
10. Make other settings that you want to use to print. See online help for details of Print
Settings.
11. Click Print to start printing.
Canceling Printing
If you need to cancel printing, follow the instructions in the appropriate section below.
Using the Cancel Button on the Printer
Press the + Cancel button to cancel a print job in progress.
Canceling from Windows
When you start printing, the progress meter appears on your computer screen.