Please follow the following simple steps in order to answer the questions:
Click on the question you wish to answer to make this the active question,
Click on the relevant option from the boxes above i.e., whichever option you think is correct, and this will automatically fill in this question box with that answer, and
Click on the next question box to activate the next question you wish to answer and select the relevant option on the top again
Click on the "Mark" button to view your score and the correct answers once you have completed all the boxes.