The center's forum
As centre director, you also have a forum. You can configure access to the forum as you wish, that is, either limit access to players who have a horse boarded at your centre or leave it open to all players on Howrse.
This forum is your responsibility. You are the moderator and it is up to you to make it come alive. You can create and set up your forum on the administration page of your equestrian center.
An equestrian centre forum that is open to all the breeders can be accessed via the details of the centre.