All you have to do is attempt to stop flamming and don't participate yourself. To show your a member have your signature include 'Forum Peacekeeper' to show that you are part of the group.
While I appreciate the good intentions behind this, if you really want to help, simply refraining from flaming, and reporting flaming when you see it would be the most beneficial thing you can do. The moderation team relies on and appreciates those reports, since we can't be in every thread at once.
I'm locking this, as it is a bit of a recruitment thread, and because we already have a "peace keeper unit" on these forums.