You will need a server-side solution. For most people this means ASP, ASP.NET, PHP, or JSP, although other options exist. Technically, you can code server-side ASP using Javascript, but most people don't. Most people use JavaScript for client-side scripting. You solution needs to be server-side because you need something that will save what people type in then display it to other site visitors later.
What is your board currently coded in? ASP? PHP? etc? Does your server support PHP? (Both Windows and Linux servers can support PHP--just a matter of whether your server host has configured it.)