<p>I am pretty new to php, but I am learning! I have a simple form on a client website. I am testing the form and when I click submit, I get the following error:</p>
<p>Form Mail Script</p>
<pre><code>Wrong referrer (referring site). For security reasons the form can only be used, if the referring page is part of this website.

Note for the Admin: Please add the name of your server to the referrer variable in the index.php configuration file: mywebsite.com
</code></pre>
<p>Powered by Form Mail Script</p>
<p>I am looking through the forms configuration and support files but I do not understand exactly what it is I need to change.</p>
<p>Can someone please explain to me what the Admin note above means and how to fix it?</p>

You are obviously using the Form Mail script on your page. It has a security feature that prevents other domains from submitting to the form. This is done to prevent bots from using the script to send out spam.
In the configuration for the form mail script or in the script itself, you will find an array or variable with the referrers listed. This is the sites that you want to allow calling of this form mail. You should add your own domain to this list or assign it to this variable.
Sorry, I haven't used this script, so I can't be more specific.