How do you setup cross controller with ps3 and PS vita?

To set up cross-controller functionality between a PS3 and a PS Vita, first ensure both devices are connected to the same Wi-Fi network. On your PS3, navigate to the PlayStation Store to download the "Cross-Controller" application. Next, launch the application on both devices, and on the PS3, select the option to pair with your PS Vita. Follow the on-screen prompts to complete the connection, allowing the PS Vita to function as a secondary controller for compatible PS3 games.