Inserting an html document into a project

I have this code below. Right below the code that says Admin Documentation I want to insert an html documement that will open on the webpage for users to follow, by pushing the 'Admin Documentation' button. The file is called Users_doc.html and is found in the same directory where the code below is found.

<?xml version="1.0"?>

<!DOCTYPE document PUBLIC "-//APACHE//DTD Documentation V1.2//EN" "http://apache.org/forrest/dtd/document-v20.dtd">

<document>

<header>

<title>Administrative Documentation</title>

<authors><person name="Jeremy Wilson" email="jeremy.wilson@esrginc.com"/>

</authors>

<notice>Initial documentation</notice>

</header>


<section>

<title>Admin Documentation</title>

<p> Push the blue "Admin Documentation" bar above for user information on the Adminstration Tab</p>

</section>


<footer>

<legal>© 2004 ESRG LLC.</legal>

</footer>

</document>