They don't work because there's a post count limit before new members can post links, to prevent spammers. The posts sit in the moderator's queue until they're approved or disapproved. I'm not sure of the number, but I'm guessing it's probably around 10 posts. I can approve the ones in queue now.
Edit: My mistake, there were no posts waiting in the mod queue. However, I do still stick to my story. I know there's measures in place to prevent people from just joining and posting spam. I still think that's the reason you were unable to post your link.