Registering a nickname on XWIS is as simple as logging in.
You no longer need to use the Westwood Registration pages, or the account creation menu in your game.
DO NOT CLICK THE NEW ACCOUNT BUTTON
Simply connect to XWIS by clicking "internet" (see below) in your game menu, and login with your desired username and password. Your password must be EXACTLY 8 characters long. Once you have logged in that nickname is automatically registered for you.
See Also:
http://xwis.net/help.html
Accessing the Internet on C&C games:
Red Alert 2 - click Internet, then custom match or quick match. If you are experiencing difficulties, choose custom match and read any error messages listed in the lobby.
Yuri's Revenge - click Internet, then custom match or quick match. If you are experiencing difficulties, choose custom match and read any error messages listed in the lobby.
Tiberian Sun - click Internet. If you are experiencing difficulties, read any error messages listed in the lobby.
Renegade - click Multiplay Internet, then Westwood Online, then Advanced Game Listing. If you are experiencing difficulties, choose chat and read any error messages listed in the lobby.
Also see
http://renegadeforums.com/