Modify User Registration of Joomla

If you'd like to change user registration page of Joomla, follow the following steps to accomplish it.

1) Change in template file (under components/user/)
2) modify /libraries/joomla/user/user.php
3) modify /libraries/joomla/database/table/user.php

and also modify users table of joomla using any db admin scripts eg:phpMyadmin

Modify those files as per your request, you will see a modified user registration page of Joomla.