to place them on before hand and then press the play button that is in the bottom right hand corner. if you placed them in the wrong spot on accident, you can pause the puzzle and re-place them in a better spot. each puzzle only gives you the exact number of arrows you will need to get your drops to the funnel, so use them wisely. there are also some scary, fuzzy blue squares floating around the puzzle that will kill your drops if you run into them. if you manage to place the arrows correctly, avoid the blue squares, and get to the funnel, then the next level will 