To view only the most recent messages on the bulletin board, just type the number of messages you'd like to see in the No. of Msgs box.
Of course, if you want to be known by something other than the name "Anonymous", it would be good to fill in the box labeled Your Handle before you send something. You should use a short name.
If you want others on the bulletin board to access some web page, or to insert a graphic or audio file, just type in the full address of the page or file you want to point to. For example,
http://www.theautochannel.com/images/tacht.gif