I would like to train myself versus comp but i don't want to play rated games. When i start a training game and i do the first move the comp never moves. Why ?
Well, if you're expecting the computer to move immediately, you're mistaken. Depending on the time controls you're using, it's perfectly normal to wait a few minutes for the computer to move. After all, you can't tell the computer what to do with its time.
Check your time controls. Using 'Infinite' isn't recommended. If you're just starting, I'd recommend 10 minutes per game.
That being said, if you're tired of waiting, you can force the computer to make a move... while the computer is thinking, go to the Action menu, and select 'Force Move'.