How to replace a cracked note4 screen?

Our company finally moved from blackberrys to android and iphones.
So one guy already dropped his Note4 and cracked it horribly. Then said he never liked it and wants an iphone instead.

How can I go about repairing this screen as we do not have any warranty or insurance on them.
Since it's useless I get to keep it when fixed so nice perk there.