Basically, what you want to do is loosen all the bolts. Then you need to loosen the red levers about 1/2 of the way.
Then just push the top in the direction you want it to go. So if it needs to go forward push the top towards the front of the car. Then while pushing it as hard as you can, tighten the bolts. I have managed to do this by myself, but a helper is a big help.
Then after two weeks do it again, and it will finally settle/mold to your car over time.