If you need to report a post/member/etc, please use the 'report' button on them. If you have a different / more general query for the staff, you can post it here in requests, but bear in mind that requests take longer to answer than reports do.
I believe you can actually do that yourself. Go to 'Edit' on the bottom of the post, after that it will open up a white background, when you see that, look for 'Go Advanced' and then it will post a screen that looks like your making a thread. when looking at that, on top, there should be a 'Delete Thread.' Try to see if that works.