Epson WorkForce Pro WF-M5799 Workgroup Monochrome Multifunction Printer with Replaceable Ink Pack System - Manual (Page 160)

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You see a screen like this:
5. Select the printer or printers you want to add.
6. Click Add to Printer Folder .
The selected printer or printers appear in the lower section of the screen.
7. Select the checkbox next to the product you want to make your default printer, if necessary.
8. Click OK .
Parent topic: Printing with the Epson Universal Print Driver - Windows