The instructions are given in a simple way on the link below. Where he mentions "a plant," simply exchange that for visualizing a moment in your day when you felt anger. Through practice, gradually, we will be able to talk to the ego of anger, to watch it and investigate it, and along the way, it will have less influence over us. Eventually, we can destroy it.
“Nothing is easier than self-deceit. For what each man wishes, that he also believes.” —Demosthenes
"Do not worry; cultivate the habit of being happy." —Samael Aun Weor