How do you do hell gate by the undertaker?

How you do it is very simple. First you must be laying down and your opponet on his knees over top of you. Next, grab their arm and put it in between your legs. Then, bend your right leg and press your shin up on their necks. Then, Put your left leg up and rest your knee on their head. Finally, grab the back of their head and push down and push your right shin up on their neck.