Dealing with angry feelings is once again a more specific skill within the skill that teaches how to regulate emotions. It teaches children how to identify anger, finding strategies to let go the anger and take actions towards it. Such strategy can be to do the turtle: hold legs firmly against chest, take three slow, deep breaths and slowly release legs from chest.
You are really mad at a friend for breaking your toy.
You need to find the right way to deal with this situation. You could tell your friend using a nice voice that you are not happy because he broke your toy. If the emotion is two intense, it can be hard to use nice talk so a solution could be to go away for a bit, take a few deep breaths before deciding what to do about it.