Ignore it. If a kid learns that they are not going to get their way from screaming and acting like a tyrant, they won't do it. If every time they start to act out they get you to interact with them, or get what they want you have just set the precedent, and they will do it every time.
If when they start yelling you get down on their level and say, "when you calm down, we will talk about this, but not until", and walk away. They will get the message.
When someone is screaming their reasoning skills are at their lowest. It will be like talking to a wall. Wait until they are calm.
Let them win sometimes. If they want something, that you don't really want them to have, compromise. We learn to negotiate from getting what we want in a positive way.