Instructions
Check your wireless connection. The remote play feature requires an Internet connection, and will not work if your wireless Internet connection is not enabled. Check your modem and router and ensure that your other wireless devices are working.
Update your PSP firmware. The PSP needs at least the 3.72 version of the PSP software in order for the remote play feature to work. If you have not updated your PSP software, connect to the Internet via Wi-Fi and download it by selecting the "software update" icon on the XMB.
Re-register your PSP and PlayStation 3. If you have let your PSP's charge deplete or you have reset either the PSP or the PlayStation 3, your registration may not be active. To re-register your PSP and PlayStation 3, connect the PSP system to the PlayStation 3 system using a mini-USB cable (the same type used to charge your PlayStation 3 controller) and then select "USB Mode" on the PSP from the "Settings" menu. On the PlayStation 3, select "Settings" followed by "Remote Play Settings". From the menu, select "Register Device". After a few moments you will see a "Registration completed" message