PLEASE HELP verifying the users response

in short, my form and display of the recaptcha is set up perfectly. i have NO idea how to verify the user response in basic html. if a scripting language is necessary PHP can be implemented. can someone be very explicit and explain the steps necessary to get this working... -- 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.