The calculator below should be self-explanatory, but just in case it's not: your chi-square score
goes in the chi-square score box, you stick your degrees of freedom in the DF
box (df = (N_{Columns}-1)*(N_{Rows}-1) for
chi-square test for independence), select your significance level, then press the
button.
Enter your values for chi-square score and degrees of freedom, and then press the button.