Anger....

How does one stop their raging anger?..

..by not trying to stop anything. Get angry. Be as angry as you like. If you try to stop it you will give it more power.
When you attempt to stop something you give it more power by validating it's existence.

What you do need to do though is to watch your self getting angry. (Become the witness of yourself as Ken Wilber would say). After a while, you will start to see the anger happening as a separate thing from you. You will not be identified with it. You will watch it as though you are watching TV.

Over time, the anger will settle down and disappear. You will not have any need for anger because it is not giving you a false sense of power any more. You have separated it from you and do not derive a false sense of life from it.

This is classic self observation in practice. It is what most call a type of prayer, but it is a non-verbal praying. It is learning to be in the silence, just witnessing, watching, observing all that arises within, including and especially the anger. Just
don't try to make something happen. The simple act of self observation takes the sting out of anger or any other strong emotion
.
Learn to let it be what it is. Of course, this is not to say that you should allow anger to manifest itself in negative or destructive ways. You are still responsible for whatever actions you allow as a result of your emotions.