Log into you wireless router and find out what security you are running on your wireless network. If the router sees the wireless printer IP then put that IP into your favorite browser window. This will bring up the networked router wiki page and you can set it up correctly onto your network.
Just let us know if the Epson uses the B, G or N frequencies.
Mac Pro Dual 2.8 Quad (2nd gen), 14G Ram, Two DVD-RW Drives, OS X 10.8.3
2006 Mac Book Pro 2.16 (first Gen) OS X 10.7.4
2TB Time Capsule, 2 TB
32G iPhone 4S Black, iPad (3rd Gen) 32G Black