To report a bad (spam etc.) post, add a tag called 'modlook' to the thread. That feed is checked very regularly by the moderating team.
The modlook tag is only for reporting issues with the forum itself - abusing this tag in the hopes of attracting the attention of a moderator to your support question will not be viewed kindly. Don't put the modlook tag on your support question, put it on things like spam, or people using signatures in their posts, or duplicate threads. Things that a forum moderator should see and correct.
Note that it is not necessary to point out the actual problem, either with a post or with additional tags. Our moderators are smart. They'll scan the thread and find the problems themselves, and deal with it accordingly. Adding your own comments just gives them more to clean up, so please don't do it unless you feel the nature of the problem is very unclear like a double (or quadruple) post.