Klara,
If you go to the main page, you'll see the forum is divided into a number of sections separated by thick blue lines, and in each thick blue line, there's a heading. There's a section called "The Workshop." The first forum (sub-heading) listed under that is "Share Your Work."
If you click on it, you'll be prompted for a password to get in. The password is 'vista'. The password protects the forum from being catalogued by Google and other search engines, and (I believe) only registered members can get in. This means that material posted in Share Your Work is private, and therefore not considered "published," which may end up being important if you wish to sell any pieces you have posted there.
Hope this helps. If you need further instructions, don't hesitate to send a PM.
Ruth