How to fix the side of the car

From here, that looks like your rear bumper and trunk corner. I will assume it is, but maybe someone else here can help you better than me??? There's a couple of ways to attack a mis aligned door ot trunk lid, some involve trial and error. The first way is to loosen the trunk hindges with a wrench and reposition the trunk lid to clear the corner while still being able to latch. The down and dirty way is just to open the trunk hatch and subtley push on it from the side to gain a few milimeters of clearance, which "may" work. Lastly, I would remove the rear bumper cover ( https://www.youtube.com/watch?v=Lqd0BxUtJVo ) and get out a sledge hammer to help "persuade" things to go back into better alignment- it may only need a few hits in the right place so your trunk opens better. I hope this helps in some way.