Try to express feelings when you become aware of them. Discuss a possible time and place with your partner to address the issue. This will help your and your partner to prepare your thoughts and will reduce the risk of saying something you might regret. Express what it is you are specifically angry about. Instead of attacking each other, attack the problem.
Nobody likes to be accused or personally attacked.
Know when to stop. If an argument does not seem to be getting resolved, it is okay to leave the argument and come back to it later. This is especially important if the emotions are very high. You don't want to say or do something you might regret. Do not hold grudges.