Introduction
User Reputation in its simplest form is a ranking of your user's benefit to your forum. Its basis comes from the opinions of all of your forum users that choose take part in it.
Users gain and lose reputation based on how their posts are scored by other forum participants. Users with the ability to affect reputation, will either give or take aways points by approving or disapproving with a post's content.
How To?

See the red circle? Yeah, every post in the forum should show that icon (looks like a star). Click it, then it will show you a box like picture above. Then give a good reason why you agree or disagree with that post. That's it!
Requirement
Agree/Approve: +1 point
Disagree/Disapprove : -1 point
You need to have at least 50 posts. If not, 0 point was given.