Answering some of your questions...

Adding profile fields to USER ACCOUNT screen:
The first rule of customizing DNN:  You typically do NOT want to alter the "core" DNN code.  If you do, you may not be able to upgrade to new versions of DNN without losing your changes.

Instead, use a third-party module or write your own module for the job.  If you only need a way to search and sort user accounts you can do this with the User-Defined Table (UDT) module or the REPORT module.  If you want to heavily customize the user registration process then it's probably worth your time to simply go for the DynamicRegistration module from DataSprings.
 

- I want to remove Address from the USER ACCOUNT page list.
This is built-in.  Go to ADMIN->USER ACCOUNTS->USER SETTINGS and look under "User Accounts Settings".  Uncheck the "Show Address Column".
 
 
- And I want to sort the USER ACCOUNTS by CREATED DATE instead of the NAME.
 Again, back to the "third-party module" or create your own.  Here's a simple sample of showing how to list the "most -recent 10 user accounts" -- i.e., sorting accounts by CREATED DATE.
 
   http://www.eguanasolutions.com/DNN_Blog/EntryID/2.aspx
 
 
Hope this is of some help-
-mamlin

Very formal answer (not to overwrite code), but....
doing a quick and dirty "hack" takes < 30 seconds, whereas buying a 3rd party module cost $$$. In my own world as a software architect at a large global company, that answer would not have been acceptable for me. 

DNN, please make changes to the the user accounts grid so that we can specify a sort order.

Meantime, for the person that asked the original question, you do it in PROCEDURE [dbo].[GetAllUsers]

WITH [tmpUsers] AS ( SELECT U.*, row_number() over (order by U.XXXXXXXXXXXXXXX) AS rowid FROM dbo.vw_Users u

Why the developers handle paging in the TSQL (this partitioning they do in SQL with the "OVER" clause, when the telerik grid is very capable of handling the paging, is strange to me) (see xxxxxxx above, and change that to your field, I use DisplayName as sort order, and my display name is set to [Lastname], [FirstName] (because in non developers world, one search by a persons surname and name, and not a strange looking username)

Here is another tip for handling YOUR hacks in DNN source code:

I hack a lot of DNN stuff (SQL, cs, css, ascx etc, and the add a comment with my name in -- JOE SOAP  or //JOE SOAP + the reason I did it. Then before I apply a DNN patch, I make a copy of the web and the SQL (Copy Database). After an update I use a file compare utility and db compare utility, filter on all that contains my name "JOE SOAP" and re-apply my hacks. (pew, still better than re-writing DNN or buying 3rd partyt modules for almost everything.

With this "compare" after every update, you also force yourself to know exactly what changes was made in DNN.

Good luck!