Could you give me a link or report the thread please? I'm a little occupied and can't seem to find it after a quick look at your posting history.
Sorry for the late response - As I said, I'm rather occupied right now :) So it's a Social Group? Easy to change it to public, however... Try reading this first, see if you can do it yourself. Knowing is better ^^ http://forums.terraria.org/index.php?threads/community-user-guide-social-groups.71/