Currently, we restrict users from adding comments to a forum topic until they have at least 10 userpoints. Points are gained by adding new posts and when people "like" your post. This was intended to allow new users to build up some degree of reputation before they can join the conversation in full capacity. Obviously, it's not quite working out that way.
If you are a new user and your intentions are good and you need points, the best thing to do send swaylock or one of the moderators a private message and ask for points. They can give you some.
My intention is to overhaul the points system in the near future. Ideas, suggestions, etc are welcome.