Press "z" to start, and if the question doesn't show up, press the green flag again. (This might take up to 5 times) Repeat this until the question show up and stays there. Click on the answer you believe that is correct, and once you choose an answer, the answer will be in yellow. If this is your final answer (which you may change) press the space bar. If the yellow bar becomes green, you got it correct and you advance. If it is wrong, you lose.