There are such guides in Spanish and in Russian, but I didn't see one in English.

Here's what you need to do:
1) First you need to register here: https://cnc-online.net/en/connect/register/

2) Then you need to log in: https://cnc-online.net/en/connect/login/
After you log in, the site will ask you to create your server login and server password. You will use these in game itself.

3) Next you need to download the latest version of C&C Online Launcher: https://cnc-online.net/en/download/

4) Install the downloaded file. Log in.

5) You'll need to hook C&C:KW now (see the screenshot below).



5) After you hooked your game, close C&C Online window and start the game via Steam as you normally do. C&C Online Launcher window will open up and click Kane's Wrath there. The game should start.

6) Enjoy!

I hope this guide was helpful. Ask any questions in the comment section below.