It is okay that we get angry, but we need to be sure we don't let our anger turn into sin. When anger crosses into vengeance or hatred, then it becomes sin. We can be angry. We can use allow God to use our anger to guide us or fix a broken situation, similar to Jesus' anger at the money changers and dealings in the temple, but in the end we need to reach a solution and forgiveness before the devil takes hold of our actions!
When you get angry, don't let it become sin or an opportunity for the devil!
Thank You for the forgiveness that You have freely given me. Help me to resolve my anger through You before it becomes an opportunity for the devil. In Jesus' name I pray, amen.