have those two people login using the administrator user name and password that is set in the WA_Globlas.php file.
then add the admin access rule to the registration page:
<?php require_once( "WA_SecurityAssist/Helper_PHP.php" ); ?>
<?php
if (!WA_Auth_RulePasses("Administrator")){
WA_Auth_RestrictAccess("users_LogIn.php");
}
?>