About the Submit button in Spirit THeme

Spirit theme has a default form to submit the email and name. I want to use the same form, however, I don't know if the user submit the button, where the data goes,...
and also can I send the reply message to the user for registering
and can I direct them to new page, instead of going back to main.

Kindly help me modify the code to do the above tasks

<form name="newsletter" class="newsletter-form" action="" method="post">
<input type="text" name="user-name" placeholder="Your Name">
<input type="email" name="user-email" placeholder="Your Email">
<input type="submit" value="Send">