recaptcha login plugin is creating mess

just half an hour ago i have installed this plugin i have also put public and private keys in settings and then logged out to login again to see the recaptcha on the admin login of my site. But when i tried to log in am seeing thisTo use reCAPTCHA you must get an API key from https://www.google.com/recaptcha/admin/create on a blank page i tried to proceed this method but not succeed please anyone help me to get my site back. -- 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://groups.google.com/group/recaptcha. For more options, visit https://groups.google.com/groups/opt_out.