How do I fit the screen back onto a bent bezel?

The screen is an exceedingly tight fit. Although your phone may be bent, I had a tough time with mine and it isn't. Make sure at the top you have the little notches in the screen slid in the proper place under the case bezel. Then work from the top down snapping it in going back and fourth. When you get to the bottom, I used a tiny flat head screw driver to lightly pry the screen upwards on the phone while gently pressing down(inwards). Little bit of wiggling and in it went.

The first part getting the notches lined up is the key. If you're convinced the phone is bent, it's aluminum. Pretty easy to form, or if you just need a touch of room you could use a nail file. My guess is that it's just a tight fit tho. Good luck!