I cannot figure out how to start a new post to a forum subdomain such as "wargames". There is no "post" feature there so figured I had to go to the actual "Forums" domain. But could not find anything related to subdomain when scroll down the topics.
If you switch to the wargame subdomain, the "Forum" drop down menu contains additional entries, including one to post a new thread there.
By using google, i alos found this forum page.