At the bottom of each users panel in the lower left corner are 3 indicators. The first one displays if a person is on, or off-line; the second one is silvery, grey looking whatever that shape is supposed to be is the Rep button this is where you can pass on Positive and Negative Rep as you feel someone earns whichever. The 3rd button is to report that Posting directly to the Mods.
That is Ft Knox in the background. I ran privates there for a few weeks as part of a school. I drill at Ft Benning mostly. I am still on the trail at least until the end of this year.