Quick guide to upgrading to the "No CAPTCHA" reCAPTCHA?

We implemented the old reCAPTCHA years ago on our site. I was wondering if there is a quick guide to upgrading to the new "No CAPTCHA" version. Thanks! -- You received this message because you are subscribed to the Google Groups "reCAPTCHA" group. To unsubscribe from this group and stop receiving emails from it, send an email to recaptcha+unsubscribe@googlegroups.com. To post to this group, send email to recaptcha@googlegroups.com. Visit this group at http://bit.ly/1dkFnYd. For more options, visit http://bit.ly/P65DvS.