Instructions
Scroll to the "Settings" icon on the PS3 menu. Select "Network Settings." Scroll down to "Internet Connection" and select "Enabled." Scroll down to Internet Connection Settings and select "Wireless."
Select "Easy" as the setting method. Select "Wireless" as the connection type. Select "Scan" to search for wireless networks.
Select your wireless network. You have the option of naming the network something else on the PS3 though this does not change the official name of the house network. Enter the password for the wireless network if applicable.
Verify the settings on-screen are correct and press the "X" button to save the settings. Select "Test Connection." The PS3 connects to the wireless network. After the test is complete, the PS3 automatically connects to the wireless network when signing into the PlayStation Network.