For player 1 on the left, use A and D to move left and right, and E to kick as well as R to punch. For Player 2 on the right, use the arrow keys to walk left and right, and N to kick and M to punch.
Note: If player 2 wins, you have to press the green flag twice for player 2 to re-spawn, for some reason he won't re-spawn on the first click. Jumping will be added soon