Hit the Insert button on your keyboard, then in the Sprite Number box, type the number of the sprite you inserted it as... in this case, it might be D0 or D1 and so fourth. In the box that says Extra Bit... besure to put 2. And then you have it. After that, the sprite should appear at the very top left hand side of the screen, if it is Sprite D0 you inserted as, then it should look like a Green Koopa shell, but since you put in the Extra bit... it'll be the sprite. Remember, since this is a generator, you have to make sure it is inserted as Sprite D0-DF. There you go.