If you are having serious problems with another member of the Boards, try to first work things out through private messages. If that doesn't work, send your complaints to a moderator.
To contact a moderator, simply go to a post written by a moderator and use the private messaging tool located under the "Contact" button in the discussion board toolbar.
You can also always report a post to a moderator by clicking on the "Report Abuse" link located in the bottom right-hand corner of every post.