Possible to add Recaptcha to form using form action with /cgi-bin/FormMail.pl" method="post" >

I am trying to help a client with a pre-existing html form on her site. She is getting a lot of spam with the form and while I was able to insert a Recaptcha form, I still need to code a way for the form to validate. Otherwise users can still send the form without filling out the Captcha field.Everything I have researched (http://bit.ly/1kLYeO3) says that I have to change the post method to this:

If the form currently has this in place:
Can I change that?If I change is to the "verify.php" action, how will the form be delivered to the client's email?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.