Anger is okay if you focus your anger in non-abusive ways.

What is making you angry? Maybe type a blog about your feelings.

Of use your anger to motivate you in some way, perhaps to fight what is causing your anger (again as long as you don't get abusive to anyone).

Probably, if you like to express yourself in words, then writing your feelings out somewhere may be best. Many online possibilities for this.

Anger is a symptom of general unhappiness towards something. Understand the issue.