You touched the middle button on the ps3 controller how do you fix it?

If you are talking about the PS button, then all you have to do is repress the button again. If you pressed the button quickly, then it brought you to the menu that is show when you first start up your ps3. If you pressed down the button for a couple of seconds, then this brought you to a menu that should say quit game, controller settings, turn off the system, turn off the controller. If you don't want to perform any of these options, and just want to continue with you game, then all you have to do is repress the PS button. This will bring you right back to your game.