Captcha

Hi....

a friend of mine is using a captcha on her website and I looked at the  
page source and it directed me to your website..

Im trying to set the same thing on my site, but couldnt find it on  
your site and am not very tech savvy other then using front page..

any help would be appreciated as I am getting spammed to death on one  
of my emails...

thanks
JT