If you are a new member who has just signed up, you might find that your first post requires approval before it appears. These post approvals are an anti-spam feature only.
We would like to stress that this is not intended to make discussion more difficult or to filter users' opinions. All posts from new members go into the approval queue, regardless of content. Our forum moderators and administrators check the post approval queue on a daily basis and you should almost always see your posts appear within the day.
Thanks for your understanding!