Restrict “messagebox” page

Hi,
How can i restrict messagebox page for users? for example i want to show messages of 4 users.

I did this with another approach, I restricted per message, but it has many many problem that i can’t solve that.

My old approach:
in templates/messagebox.php

line 44:
$i=1; // added by myself
while ( $messages->have_posts() ) {
foreach …
…
if($i++ > 4) { // hide messages up 4
echo “it is restricted”;
}
break ; // show messages
echo “it is not restricted”
end foreach
end while
Although this approach compatibility worked, It depends on messages count.

But i wanna show messages per users, So only show messages of 4 users for example,Not any more.

Is it possible with ‘fep_get_participants’?

Thanks!