Instructions
Scroll to the "Settings" section of the PlayStation 3 XrossMediaBar (XMB) menu.
Highlight "Network Settings" and then press "X."
Highlight "Enable" and then press "X." Press the "Circle" button to return to the Settings menu.
Scroll to the "Music" or "Video" sections of the XMB menu. Highlight "Search for Media Servers" and then press "X" to actively broadcast the console on your network.