Originally Posted by ILLusion
At the bottom left of every post... underneath poster's name, under the avatar pic, underneath the join date, location, and post count... there should be a couple of icons. Click the one that looks like a red & white triangle with an exclamation mark in the middle. That icon is the report post function. Fill out the form and once submitted, that post will be reported.
I think he may have been referring to PMs (if he wasn't, then same Q for me, but regarding PMs). I don't have the 'report' triangle when I'm in PMs. I got spammed a few times, but just deleted it, but would have reported it otherwise.