[Margaret Pilkington]

On the left hand side of each post(under your name and avatar) there are three icons..... A circle which is green if you are online...grey if you aren't. A Pair of scales....if you click on this it will give you the option of giving good Karma(green stuff)....or not so good Karma(red stuff).
The exclamation mark in a warning triangle is to report posts which you feel are inappropriate or infringe the rules of the forum(Swearing jumps to mind as an example of what I mean).

I hope this helps.