Unless your TV supports the feature you will need a converter to hook up to your TV that supports either broadcast/receiving to a Device. Most TV's do not support home networking to a device through WiFi.
There are several companies that sell these devices.
Here's one:
http://sewelldirect.com/wireless-pc-to-tv.asp
If your TV does support home networking it should have a channel that you connect to (like netflix/hulu) to browse and documentation on how to set it up. Other than that the WiFi connection is so that your TV has access to your wireless internet to be able to use channels like netflix/hulu wirelessly.
If you're wanting to stream your PC to your TV and your TV can browse justin.tv or twitch.tv you'll have to do it that way.