How can I express my anger in a positive manner?

1) Be honest and speak (Ephesians 4:15, 25). People cannot read our minds. We must speak the truth in love.

2) Stay current (Ephesians 4:26-27). We must not allow what is bothering us to build up until we lose control. Dealing with and sharing what is bothering us before it gets to that point is important.

3) Attack the problem, not the person (Ephesians 4:29, 31). Along this line, we must remember the importance of keeping the volume of our voices low (Proverbs 15:1).

4) Act, not react (Ephesians 4:31-32). Because of our fallen nature, our first impulse is often a sinful one (v. 31). The time spent in “counting to ten” should be used to reflect upon the godly way to respond (v. 32) and to remind ourselves how anger is to be used to solve problems and not create bigger ones.

Source: http://www.gotquestions.org/anger.html