If you see the error: "Sorry, but this form could not be processed. Please contact site administrator." on your contact page after you submit the form there is an easy way to solve this!
This error means that the program does not know where to send the information from the form. To fix this, login to your storeadmin and go to Site Settings. You'll see it asks for an admin email. Enter the email address (a working email account) there you'd like all of your notifications from your website to be sent to. Save your changes and test your form again.