Epson C2600/2600 Owner's Manual page 86

Note:
If the Assign to Paper Source check box is selected, the form
name is displayed in the Paper Source drop-down list on the Basic
Settings tab.
7. Type the form name in the Form Name box and its description
in the Description box.
8. Select To Front or To Back to specify whether the overlay will
be printed as background or foreground of the document.
9. Click Register to apply the settings and return to Form
settings dialog box.
10. Click OK in the Form Settings dialog box.
11. Click OK in the Overlay Settings dialog box.
12. Print the file saved as overlay data. It is possible to save any
kind of file as an overlay. The overlay data is created.
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Using the Printer Software with Windows