Requires Pro Standard or higher
To help reduce spam and other forms of abuse, you can optionally enable Google reCAPTCHA to silently detect suspicious submissions and, if necessary, require the completion of a challenge to proceed.
If you haven't done so already, log in to the reCAPTCHA Admin to register the site and create your API Keys. Be sure to select "reCAPTCHA v2 → Verify requests with a challenge" when registering the site, and note that these keys can be re-used to enable reCAPTCHA on all forms on the site.
Select a Form element.
Click the Form tab.
Scroll down to Options and check Protect with reCAPTCHA.
Scroll down to reCAPTCHA.
Set Site Key and Secret Key to your previously-obtained API Keys.
(Optional) Uncheck Show badge to hide the reCAPTCHA badge that's normally displayed in the bottom-right corner of the site. Note that if you choose to do this, you must add a message before or after the form indicating its use of reCAPTCHA (learn more).
You're done! The form is now protected by Google reCAPTCHA.