Any emotion feeds on it's expression. The more you express an emotion, the easier it becomes to express it more often. If you're having a problem with anger, that means that you've expressed it often enough to make it so easy to express again without really thinking about it. If you want to eliminate the anger from your life, you have to stop feeding it (stop expressing it), and start expressing the opposite emotions of love, acceptance, and joy instead.
I will assume that if you're reading this, you have some very strong motivations to help you stand by your committment to changing your mental/emotional focus.
The problem that a lot of people get into when trying to stop expressing an emotion is that they bottle it up inside where it festers and grows to the point where it blows up explosively. There is a way to avoid this, so that you may release the anger completely, allowing it to drain away from you and never come up again.
The proper way is to not bottle it up, but rather to refuse to acknowledge it's presence. When people bottle up an emotion, they still focus their mind upon the emotion that they are resisting. In the the Keys To Power Mastery System, we teach that any time you focus upon an emotion (or anything for that matter), you increase the amount of Power that is working to create that emotion in the future.
What you will do from now on is to take time out to visualize the anger that had been a part of you now draining out of your body, out of your mind, out of your soul. The anger will leave you completely, making you feel lighter and more energized. With the anger drained out of your soul, you will start to feel the natural joy that comes from Spirit. You will begin to see the world around you as a place where you can experience as much joy as you care to claim. The emotions of love, acceptance, and joy will well up within you, filling you with so much happiness that there will be no room for anything else. And as this joy fills you to overflowing, you will begin to find yourself naturally expressing joy at all times, even those times that used to invoke anger. And the more you do this, the more that joy will conquer anger, and your life will transform into a radiant expression of the Divine.
At some point, you will find yourself acknowledging that you are the only creator in your life. You alone hold the Power to create the experiences that you find on your pathway of life. When you fully understand this fact, then you will also find the evidence that shows where you directed Power to create the situations that made you angry in the past. You will also understand that as you continue to focus upon love and joy, that those emotions will create better experiences in your life that you will enjoy.
I hope that this gives you the encouragement you need to devote enough time to eliminating the anger from your life. In my case, I needed to spend a few hours a day on the project for a couple of weeks before the anger was completely gone from my life. But as they say, a journey of a thousand miles begins with a single step, and that a castle gets built one brick at a time. Take each step as they come up, and you will transform your life as much as you want.