Very simple. Just press the left and right arrow keys located at the bottom right corner of you keyboard to try and dodge the ducks.
You have 3 lives and every time you dodge a duck, you get a point. Try to aim and get as many points as you can. Once you reach a 5 point checkmark the game will get gradually harder. This game is targeted at 8-10 year olds because of the different characteristics and weird characters.