Anti-spam for Caldera Forms Adds A Google reCaptcha Field To Caldera Forms Go to reCAPTCHA Site and click “Get reCpatcha” button. In “Register a new site” choose reCAPTCHA v2,v3 or Invisible reCAPTCHA. Add your domains and complete form. This will show you your new public and secret key. On your WordPress site, go to the Caldera Forms editor for form you wish to add a the captcha to. Drag “Add Field” bar into the form layout where you want the captcha to appear. In field settings enter public and secret keys.