It's pretty simple. Start the app and with a steady hand just point the camera at the face on the screen and tap the "auto" button.

The following is the effective distance table which measures the distance from the iPhone to the screen in order to effectively capture the frame:




The optimal frame has the celebrity looking directly at the camera, just like a passport picture, and the iPhone's camera is pointed straight at the screen. Any sharp movements, illumination problems, profile angles, extreme facial expressions, sunglasses, masks or heavy makeup all create a great challenge for any face recognition technology.