This should be self-explanatory, but just in case it's not: your T Score goes in
the T Score box, you stick your degrees of freedom in the DF box (N - 1
for single sample and dependent pairs, (N1 - 1) + (N2
- 1) for independent samples), select your significance level and whether
you're testing a one or two-tailed hypothesis (if you're not sure, go with the defaults),
then press the button!
Enter your values for T Score and degrees of freedom, and then press the button.