Probably more of a mod question but lets see if I can help you out.
Ok to start figure out where you want the thread I.E General discussion, custom project etc.
Once you know that select a thread from the home page (any will do).
Once the thread opens look to the top left of the page. Under the Home option you should see several quick links (it should be on this very page;) it should look something like.... Hisstank.com> Hisstank.com-gijoe> General discusion> select the 2nd option. When the new page comes up you sould need to choose a topic so select where you want the thread.
Now you sould see new thread as an option on the new page, on the upper left side about 1/8th done the page.