In reCaptcha Settings section you can add API keys. It’s an important step if you want to use reCaptcha further in you contact form.
To apply these keys, navigate to Theme Options -> reCaptcha section in your dashboard.
reCAPTCHA is a program that can tell whether its user is a human or a computer. You’ve probably seen them — colorful images with distorted text at the bottom of Web registration forms. CAPTCHAs are used by many websites to prevent abuse from “bots,” or automated programs usually written to generate spam. No computer program can read distorted text as well as humans can, so bots cannot navigate sites protected by CAPTCHAs.
You can get reCaptcha API keys by clicking the Keys link in your admin panel or by following this URL: get reCaptcha keys.
After you’ve have managed reCaptcha and applied its keys, it can be added to your Contact Form generated using shortcodes.