Cake man.
You'll need to remove the bumper and then remove the cover from the reinforcement.
Now get an heat gun, a golf ball, work gloves and some compressed air. If you don't have acess to an air compressor a squirt bottle will work too.
With the heat gun, warm the BACK SIDE of the dent. There is a fine line between hot enough and too hot. So be careful. Warm it up so it will move when you push on it. Gently roll the golf ball around the back side of the dent, pusing it out evenly wile cooling it with the air or water. It might take more than a try or two.
Just don't get it too hot and don't press from the front.
Good luck.