Diggit Drupalextras

Hello all,
I used module (simplenews, simplenews_register, simplenews_register_block). I tested register email subscribe. so, I was created a newsletter and i send to subscribe email. I go to "Content management \ Newsletter \ Subscriptions but not see email have just subscribe. Please help me, when a user subscribe the email will mass to subscription and when I create a newsletter, I can send it to all user subscribe. I want write a newsletter module for drupal.
please help me. Thank you very much.