1. You will need 2 programs, Red Alert 3 on Steam, and C&C:Online client, install both.
2. You will also need an account at C&C Online. Their system uses a main account, and once logged-in register a Server Account. You will use the email from main account and password from Server Account in the game.
3. Next Open Red Alert 3 from Steam, and the C&C Program, and go to Hook drop-down and select Red Alert 3.
4. Once the game is hooked, close everything, the game and program.
5. Try to open Red Alert 3 on Steam, it will open C&C instead, then use the big “Red Alert 3” button to open the game.
6. Go to Online→Versus, and login using your email and Server Account password, use any ID you like.
7. Have fun!