Add Google's reCAPTCHA noCAPTCHA to front-end forms powered by the WP User Manager plugin. This is an addon for WP User Manager.
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Add Google's reCAPTCHA noCAPTCHA to your website and protect your site from spam registrations and login. This addon lets you choose which forms you wish to protect, you can decide to display the recaptcha field into the registration form and login forms, all with just a few clicks.
Please read the online documentation http://docs.wpusermanager.com/category/77-google-recaptcha to learn how to setup this addon. Setup is really easy and should take only a few minutes.