After you click the "Start" button, a list of five words will be displayed. Simply scan the list of words, without dwelling on them, and select one. Go with your first impulse when making your choice. Another list of five words will be displayed. Do the same with this list and click the "Next" button. There will be twenty sets of five words each. Continue in the same fashion.
After the last word is selected, you will see a list of your selections with an explanation of the purpose of this exercise.