Maybe you are getting the Standard Deduction. Adding deductions won't help until you enter more than the Standard Deduction. And then only a little for the amount that puts you over the Standard Deduction. But you can deduct up to 300 for Charity in addition to the Standard Deduction on 1040 line 10b.
Go though the deduction section and enter your charity amounts. Then keep going and finish that section. It should say the Standard Deduction is right for you. Then it will add the amount to line 10b.
