You need to have a Gameshre-compatable gam like Namco Musum Collection, Burnout, or Fired up (there might be other games, But that's all I know). When you have the game inserted, you start the game. IN THE _GAME_ you go to wherever the gameshare option is. Your friend or whoever you share it with goes to the PSP menu and selects gameshare. You send the game to him/her over wifi and they play it.

And Wipeout does not have it.