Open up mod/user.php.
Find the line:
PHP Code:
// ###################### Start viewuser #######################
Then find the line
PHP Code:
$user=$DB_site->query_first("SELECT userid,usergroupid,username,password,email,parentemail,coppauser,homepage,icq,aim,yahoo,signature,adminemail,showemail,styleid,invisible,usertitle,customtitle,FROM_UNIXTIME(joindate) AS joindate,cookieuser,daysprune,FROM_UNIXTIME(lastvisit) AS lastvisit,FROM_UNIXTIME(lastactivity) AS lastactivity,FROM_UNIXTIME(lastpost) AS lastpost,posts,timezoneoffset,emailnotification,emailonpm,receivepm,ipaddress FROM user WHERE userid=$userid");
Add this below it
PHP Code:
if($user[usergroupid]==6){
echo "<p>You do not have permission to do this!</p>";
exit;
}
As always, be sure to back up files you modify before modifying them. I may have made a typo, etc.