Are you talking about the IP Address display in the for every post?? In the forum_posts.asp (v7 that is) you find a block like:
'If the user is the admin or moderatir then display the authors IP
If (blnAdmin OR blnModerator) AND strAuthorIP <> "" Then
Response.Write(" - " & strTxtIP & " <a href=""javascript:openWin('pop_up_IP_blocking.asp?IP=" & strAuthorIP & "&TID=" & lngTopicID & "','move','toolbar=0,location=0,status=0,menubar=0,scrollbars=1,resizable=1,width=425,height=425')"" class=""smLink"">" & strAuthorIP & "</a>")
Else
Response.Write(" - " & strTxtIPLogged)
End If
Just comment the part out where it writes the ip address