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The adhesive holding the screen to the faceplate needs to be heated to separate the two. Remove and discard the cracked screen.

Summary:
Now that your detached faceplate is ready to be repaired, remove the square 'home' button and set aside. Lay the faceplate face up and heat with a hairdryer. Now replace your 'home' button and lay your replacement screen over your faceplate. Heat the faceplate with your hairdryer to allow the adhesive to bond with the screen. Let your screen cool down and make sure that it has adhered to the faceplate completely. Put your iPod back together carefully by reversing these steps.