Click 'Start' after the game has been loaded. Then click the 'Player' button from the coming menu screen to choose your fighter and re-click 'Start' to begin the game. You can set the game to '2 Players Mode' by clicking 'None' while selecting a fighter. Use the arrow keys to navigate your fighter, and click the left mouse button or press the enter key to move. In '2 Players Mode', use the 'W, A, S, D' keys and 'Space' or 'Y' keys to move. Have fun!