If you have enabled reCaptcha from the add-ons section of your WP Crowdfunding settings, you will see this reCaptcha tab in the WP Crowdfunding settings. reCaptcha is helpful for preventing spams on your site.
Enable reCAPTCHA on the user registration page
Mark the checkbox if you want to enable the reCaptcha feature for the user registration page. This will prevent bot user registrations.
Enable reCAPTCHA on campaign submit page
Mark the checkbox if you want to enable the reCaptcha feature for the crowdfunding campaign submit page. This will prevent false campaign submits.
Site key / Public Key
Put your Google reCAPTCHA Public key here to enable reCaptcha for your site. Visit this link to generate one.
Put your Google reCAPTCHA Secret key here for your reCaptcha to work properly on your site. Visit this link to generate one.