The digitizer and glass are glued to the screen bezel. The glass can be removed by heating it with a heat gun until the glue is soft enough to pry up. THIS WILL MOST LIKELY BREAK THE GLASS.

The digitizer can be replaced by first sliding the chip and flex cable through the trackpad hole and sliding it into the opening provided.

When you're ready, remove the strip to uncover the adhesive for the glass and carefully place it on the screen bezel. Place it properly the first time as once it's in place it cannot be moved.