Warcraft 3 classic CD key

I own the original Warcraft 3 RoC and TFT. I followed the instructions on the website and installed Warcraft 3, but I never got the message asking me to enter my CD-key. It just asks me to log onto battle.net, and when I put my identification and password it gives me an error. I do not own Warcraft 3 reforged. How can I play the classic version please ?

Check these instructions at the link below.