How do I fix or replace a hinge

This is the 2nd time my hinge has broken. First time I had Geek Squad fix it and they just sent it out to their main center instead of in store. This time I want to try to do it myself. The hing works but as I close the screen, the top cover separates from the LCD by the hinge. Do I need to replace the hinge? If so, how?

It looks like this. I don’t even know how to get the display cover off. It almost looks like I can just attach the LCD display top better, it will work fine.