Is this the only forum you are on? Be on other forums and promote it in your signature. I had it on my signature on a forum with around 300 000 members and so I got the word around quick. Soon, people started asking questions etc. That can get people interested and thus get you members.
However, what goes inside your forum is dependent on you. You can expect members to post. They can just sign up and do nothing. You must entice them and give them a good reason to post. If its just your normal type forums, they may as well go to and established forum to do that.
I don't see a link to your forum in your signature. Maybe thats why no one knows about your forum. What about in your profile? Fill that up and people will know a little more about you and your forum. These little things do contribute and will have a long term effect. Add an image (signature), do some exchanges, and get the word around. Other than that, you can't expect anything to come out of the blue 🙂
