Pete – The default contact form just comes with a simple human check which looks for an answer to a simple mathematical question and if incorrect, errors out. No captcha support integrated for this native contact form.
If you need captcha support, I would ask you load the contact form 7 plugin (the theme supports it by providing the required styling). It’s pretty robust and has lot more functions including integration with another captcha plugin (the contact form 7 plugin comes with the required instructions for this). Thanks
I have just added this shortcode [contact_form mail_to=”email@example.com” human_check=true phone=true web_url=true subject=true] to a widget in the footer of the page, but only the little box showing for the human check… the mathematical question is missing.