how to delete a post?

If no one has posted after you in the thread, you should still be able to delete it via the X button on the right side (next to the edit button).

If someone has posted after you in the thread, then all you are able to do is edit your post, and at that point (with other posts after yours in the thread) the container for your post will remain and it will note that you edited the post (and when, and how many times).

Hope that helps...