<?php
$mailbar=1;
$group=1;
include("maillist/mailbar.php");
?>

where maillist is the dir of the script . There are four types of the mail registrations.( see index.php as an example) 
By $group= you fill out the group number ( if you make a new group it will be number 2 and so on) 

And put the following code in your main page

<?php 
if(isset ($_GET['page'])) 
{ 
if ($_GET['page'] == "mail") 
{ 
include("maillist/mailmain.php"); 
} 
if ($_GET['page'] == "about") 
{ 
include("about.php"); 
} 
}else { 
/* include( your messages "); */ 
print(":Your un/subscribe messages here:"); 
} 
?>