See the definitions of No CAPTCHA reCAPTCHA and CAPTCHA

  1. Go to your Dashboard
  2. Click on Settings
    • Additional sidebar items will unfold
  3. Click on WP-reCAPTCHA
    • The page will refresh and show reCAPTCHA settings
  4. Look at the "Authentication" section
    • If the "Public Key" and "Private Key" fields are blank, go to: https://www.google.com/recaptcha/intro/index.html to get keys
    • Copy and paste the respective keys in the fields on your "reCAPTCHA Options" page in your WordPress site
    • Be sure not to mix up Public and Private keys
  5. Click Save reCAPTCHA Changes
    • The page will reload and a message will appear confirming these changes
    • A "I'm not a robot" reCAPTCHA box will then appear wherever comments are allowed in a WordPress site.