Instructions
Look at the label on your wireless router. Certain wireless routers do not allow users to create their own SSIDs, and instead use a predetermined ones. If this is the case, the SSID for your wireless network will always be written on the bottom of the unit, on a label that can't be removed.
Find out which network your computer is connected to (if you're planning to use the same one to connect your PSP). Click the "Wireless" icon on your computer to view the SSID of the wireless network your computer is connected to. You can then use this same SSID to connect to the network on your Sony PSP.
Select the "Scan" option on your PSP. Your Sony PSP allows you to connect to a wireless network in one of two ways -- you can manually enter an SSID, or your can select "Scan" from the same screen. The PSP will then scan the area and provide you with a list of names of available wireless networks. Choose the SSID of your network from this list.