Install plugin
Download file ReCaptchaValidatorPlugin.dll and install it to KooBoo CMS.
More info about plugins - http://wiki.kooboo.com/?wiki=Page_plugin_development
Register ReCaptcha
You need to register on Recaptcha-site and get two keys - privatekey and publickey.
You must enter this keys on settings of your KooBoo site as "Custom Fields". Call them: "recaptcha_privatekey" and "recaptcha_publickey":
If you use this plugin for send mail, you need to set SMTP settings:
Now you can use this plugin: