Instructions
Register your consoles. Navigate to "Register Device" under "Remote Play Settings" located under "Settings" on both the PS3 and the PSP.
Log into your PlayStation account and make sure you are signed into the PlayStation Network. Set your options so that you automatically log in upon console start.
Navigate to "Settings" and "Remote Play Settings," selecting the option to "On" under "Remote Play Start."
Set your console into standby mode.
Connect your PSP to the Internet using wireless Internet.
Navigate to, under "Network," "Connect via Internet". Sign in with your login information from before. Upon success, your PS3 screen should appear on your PSP.