You are right, I think newbies need some explanation. And a fair amount is posted on this thread, so, I'm not really sure what else is needed. Let me know if what I post here doesn't cover it:
Newbies are moderated until the moderator on the forum has observed good posting behavior. The moderator approves each post, and then recommends to the administrator that the post can be unmoderated.
The goal to approve individual posts is 24 hours. There are very few moderators, and they have other full-time jobs. So, there are times that this approval does not happen within 24 hours. We apologize, we are committed to you, sometimes the timeframe is unavoidable.