Go to Vbulletin Options -> Cyb - Chatbox
That option is under the Permissions sub heading (about 2/3rds down the page)

Hope that helps.

Permission options:

1.Usergroups able to view ChatBox but not post messages
2.Usergroups NOT able to view ChatBox (comma separated ID list)
3.Users banned from ChatBox (comma separated UserID list)
4.When user is banned via menu in ChatBox Archive this field will be automatically updated
5.Users with post count less than X can not view ChatBox - Set X
6.Groups able to moderate ChatBox (comma separated usergroup IDs)
7.Allow users to delete their own messages
8.Banned BB Tags (comma separated, example: img, code)

under permission i have statistics:

1.Top X Chatters - Set X
2.Messages in last X hours - Set X
3.Seconds to show "new messages since last visit" stats

and under statistics have other oprions:

1.Auto prune messages older than X hours - Set X (Blank to disable)
2.ChatBox always collapsed by default (ChatBox Full not affected)
3.Automatically add link to ChatBox to NavBar

I cant find what you mean?

This is a great chat box. It is light and working so well. it can be used as both a Shout box and a full chat box. In stalled it on my site last night and people like it. Great job!

I installed and it works really well but I have two questions which I could not figured out.

1. I could cont find a way to integrate it with vbadvanced and I asked questions there. Someone said "there is instructions supplied by CYBERNETIC as to how you add his products to the portal with hiis downloads and at vBulletin.org. " I count fine it. Anybody can point out if you know there is an instruction?

2. I like to have the Chatbox to show on both http://www.rchelicoptertown.com/index.php and http://www.rchelicoptertown.com/forum/index.php. Right now it shows on the latter. How do I also set it to show on my index.php?

Thanks. Again it is a great mod!

How can i make some table, similar to one, found on thread pages, like "people currently reading this thread" kind of thing on chat page, so we could see who are now in the chatroom. As now it's pretty lame to come into a chatroom and don't see anyone in it :(

For those that are having the problem of loading.... on vbadvanced theres a nice solution found over on the vbadvanced forums.
http://www.vbadvanced.com/forum/showthread.php?t=32031

Is there any plan to add a search by username feature. For example searching for all shouts by a particular username?

What should i do to delete navbar chatbox button? i can't find it in navbar template...

Nevermind ...

very nice chat mod, installed at www.businessmeet.com anyone like to view how does this chat work just check in this site

I'm still wondering, along with several others, how to put the chat on another page besides the index page!!