Forum posters are NOT allowed to recruit for other forums. Dozens of topics have been started over the years just to try to get users to sign up on yet more forums.
This is a waste of time.
It's also rude to do this on another person's forums.
Also, my forums aren't even popular.
Feel free to start topics about your sites, your projects, your new content of any kind just NO MORE FORUM RECRUITING. It's just dumb.