[Chris M]

If you want to do it on a "per-user" basis, try this

Open mod/user.php
Find:

require("./global.php");

modlog(iif($userid!=0,"user id = $userid",""));

Underneath add:

if (($userid=="1") && ($bbuserinfo[usergroupid]!="6")) {
echo"<p>You cannot view this profile!</p>";
exit;
}

It works just as well as Logician's code, except this can target specific users as well

Satan