in shoutbox search for the value ASC LIMIT and change to DESC LIMIT also to ban members u go into there userdetails and select chat = no
Code:
if ($CURUSER["chatpost"] === 'no'){
echo'<h2>
<center><font color=red>You are banned.</font></center></h2>';
die();
}
as for clearing all shouts no but it does limit the shouts to 200 and delete after theres 200