![Image](http://content.screencast.com/users/normis/folders/Jing/media/159f4cde-aaeb-4409-8003-4fc81c35997b/2010-04-23_1221.png)
The voting is on a per-post basis, so if somebody posts a very helpful message, you have to vote for this specific message. You can choose "karma power", or - how many points you would like to give the poster. 1 is for a generally helpful post, and 5 is for a life saver which is super detailed and universally helpful. You will also have to describe why you give these points, you can clarify that for example "this post helped me to fix my network".
You can vote only once during 6 hours, so spend your votes wisely. The more you vote, the more we will see the emerge of most helpful forum members.