I am not itemizing and am using the standard deductions. Somewhere along the line I entered $120 of charitable contributions and this amount is now on line 12b. Since then I have found more contributions so I want to increase the amount of line 12b. I have no idea how to do it. I tried to go back and track how the $120 was originally entered and can't find it anywhere. How do I change the amount on line 12b?
