miss shimmy's got it. The scale icon accompanies every post a person makes, you can click that scale and choose I approve or I disapprove and add comment about the person's post if you like.
I've another question:
When 1 person had added to my reputation, I had 10 points total. Now someone else has added to my reputation too and I still have 10 points total. How does this points system work? How come it doesn't seem to change?