If you post something helpful people can add to your reputation or if bad they can take it away (everyone can vote either way
using the scales under the members name by their post).
You also earn repuation by
starting new threads and posting messages plus every month you have been a member means you get more reputation. The more posts you make the more reputation your earn.
I noticed you had made quite a few helpful posts so thought some reputation was long overdue for you. I hope that helps?
Overall its just a way of seeing who the regular helpful members are and who is new. Its interesting to note that no one has earnt a bad reputation on here yet.
