There is two things that needs to be copied:
1. the include file (<?php require_once("../HTMLEditor/WARichEditorPHP.php"); ?>)
2. the editor source (<?php
// WebAssist iRite: Rich Text Editor for Dreamweaver
$WARichTextEditor_1 = CreateRichTextEditor ("ContentValue", "../HTMLEditor/", "924px", "400px", "Custom", "../custom/contents_insert_ContentValue1.js", "".((isset($_SESSION["ContentValue"]))?$_SESSION["ContentValue"]:"") ."");
?>)
But in both cases you need to make sure that the reference to the files are correct.