|Do you have the manual for the printer?|
Presuming so, did you follow the installation instructions "exactly"?
If Epson follow the routine used by Canon, then you install drivers for usb first, then connect the printer (and power it up). Then you go through the network driver installation routine. And typically you are allowed to use either wifi or ethernet (if the printer has both options) but not both at the same time. You have to disable (switch off) the unused option.
Can you print via usb from your computer!?
Does the test page include the printer setup details for its networking?
There is usually an option to print out the settings/config (the terms are often misapplied) for the printer; and the network info will show if the printer has actually got an ip address off your router.
Does the printer show in the list of printers available to use from your computer?