@seabeds - Sorry, I will try to make it more clear.
Log in as admin and go to Home > Options> Taigachat Pro
When "Forum activity display" is set to "Show new threads and replies" or "Show new threads only" and "Forum activity permissions user" is set to 0 (which is default), only the topics that guests can see will appear in the Shoutbox forum activity. If this is fine for you, you do not need to do anything else.
If you want to customize what threads appear in the shoutbox (for example, if you have a forum that members can only see when logged in, but you want those that forum's posts to appear in the shoutbox, too), you can set a user ID in the "Forum activity permissions user" box. The Shoutbox will "see" the forum activity through the eyes of that user. I recommend creating a new user account for the Shoutbox to use (I just call mine "Shoutbox"), and entering its user ID here. You can then set the Shoutbox account's forum permissions to see only the forums that you want to show in the shoutbox. On my forum, I also use this same account to post the logs to the forum.
Thank you for clearing that up!