First read through all the statements. Then select the three statements you agree with most and check the "Agree" boxes in front of those statements. Next select the three statements you disagree with most. After you have selected the statements you agree and disagree with most, you should have three statements left on which there is no check mark.
It may happen that you agree or disagree strongly with more or fewer than three statements. If so, feel free to comment, in the comment box below, on any discrepencies between your "forced" choice and your actual opinions.