To create a new forum topic go into 'create content' on the left hand side bar on the home page, then click on forum topics. Its pretty straight forward from there as regards the subject and the language options*. The forum topics are limited, but if you wanted to add another category eg copyright, then you would click onto content management on the black bar at the top of the home page, click categories, then click add term on the forums. This gives a few options such as the parent category, which you may want to put under the term 'site building' for example.
