Apply a suction handle to the center of the bottom edge of the screen, as close to the edge as possible.

If your display is badly cracked, cover it with a layer of clear packing tape to help the suction cup adhere. Alternatively, you can pull using very strong tape instead of a suction cup. If all else fails, try supergluing the suction cup to the broken screen.

Pull up on the suction handle with strong, steady force and insert an iFlex between the screen and frame.

Make sure to unsert the iFlex under the screen, not the plastic frame.

Depending on the age of your phone, this may be difficult. If you're having trouble, apply more heat to the bottom edge and try again.