[Plugin: Contact Form 7] Referring URL in Sidebar Contact Form

Hi,

Is there a way to show the referring URL in a message sent from a sidebar contact form?

I have read this post, but it does not explain how to do this in a sidebar form.

https://contactform7.com/2009/12/25/special-mail-tags/

Thanks!

-Josh

https://www.ads-software.com/extend/plugins/contact-form-7/