Go to the science lab in the school. Put the chemicals in the test tube in the following order: blue, red, yellow, blue, yellow. The arrow to one or two. If one setting does not work, try the other. Once you put the chemicals in the test tube in the correct order and the arrow on the correct number, you will get a stink bomb.
Put equal amounts of blue and yellow in the test tube to make it turn green. Turn the heat on, then select any number from 1 to 5.