If your Tv does not have some form of network connection(WiFi or Ethernet) you will need a computer connected to your TV with HDMI or DVI or VGA or component video.You can also use one of those "connected media player boxes" like the boxee box and so on...

Check with your RCA manual there will be a setup menu. Set the TV to use DHCP to connect to your network.OF course you will have to connect your network cable to your network (Access Point,Router,Switch or what ever.

or you can use a wireless dongle to connect to your router