First, place the batteries into the fountain, located at the bottom of it. Then, take the required amount of water about 6oz and pour it into the bottom piece on the inside of the fountain. The water should go down and disappear, that's when you turn it on and it will start to function.
not sure if the entire question is here, however, for most fountains you put the water where you can see. For example if it has a waterfall effect and runs into a basin then you would fill it up there. Once you turn it on it should start to function properly.