If the game is rated, it will be automatically saved. If not, you have to save it when it ends.
To review the game go to "set up position" click on "done" without doing anything and choose any player. Then go to file, load previous saved game and select your PGN game to load. You will have the move list interface. You can play variations and save them as well. If it was an unrated game and you undid any move, you will see the moves you undid as well as variations.
Being unorganized and all, I lost the user manual for Chessmaster 10th edition. I was wondering how I could get up the move list for a game I'm playing/have played, and if they have them already in PGN files?
Thanks!