title: form action from phtml to controller
body: <p>I am developing website in which i have signup newsletter in my home page.</p>
  
  <p>I don't want to use default newsletter feature available in magento. But i want implement it this because of some other customizations i want. But i am not sure how i can call the controller(to make entry in database and give response)  when signup/submit pressed. </p>
  
  <p><strong>Questions</strong><br>
  How can i do this?<br>
  Is there any other preferable way to implement signup feature manually ?</p>
  
  <p>Any help would be appreciated.</p>