Creating SQL Alias after configuring SharePoint 2013 farm

I am trying to configure sql alias in SharePoint farm. I have followed various articles about configuring it through cliconfg.exe and it looks fine. I have rebooted server and all the services.

When I go to system settings in central admin -> Servers in the farm , I still see sql server name and not alias name. I am basically trying to move my sql server to different machine and would like to make sure SharePoint is looking at alias name and not machine name to connect.

I have checked reg file too HKEY_LOCAL_MACHINE\Software\Microsoft\Shared Tools\Web Server Extensions\15.0\Secure\ConfigDb and it is also pointing to my sql server and not alias name. Any idea how can i change it?