ah an Epson… I changed my Epson 220 to a Ethernet a few weeks back, the IP for the printer was set on the ethernet card in the printer from the factory, so i do not believe you can change it.
Never the less, all I had to do was go to (I’m using Windows 7) Windows > Start > Printers > Add New Printer > Network Printer > wait for windows to see the printer, and if it does not just enter the IP 192.168.192.168 and it should see it.
If not, open your router config and see if there is anything else with that same address… if there is then change the IP of the other device, then connect the printer again.