[LifesGreatestGift]

AdminCP->Settings->Human Verification Manager

Select "reCaptcha" and hit save.
Then go to http://www.google.com/recaptcha/whyrecaptcha
Click "Signup Now"
Enter your sites url mysite.com
Even if your forum is mysite.com/forum/ only enter mysite.com

Hit "Create Key"

Copy the Public Key and go back to the admin page for verification and paste it inside the reCaptcha Public Key field, do the same for the Private Key but paste it in the respective reCaptcha Private Key field on the admin page for verification.

Choose your desired reCaptcha theme

Hit Save and you are done.

To see what the different themes look like select and save them, then open your registration page in another browser or incognito window to see what it looks like. Change as desired.

Refer to attached images.