Right. It looks like this:
When you find a post that doesn't meet our standards such as spam, insulting other members, etc., press that button on the post and give a brief reason for the report.
I want to take this opportunity to thank all members who use the Report Post function. It does help us a lot even though we rarely get a chance to thank the individual reporters. That function gives us literally thousands of eyes watching out for the integrity of TFL instead of only those of the moderator staff.