The number should be your federal itemized deductions. You may have to pay and print your return to look at the Schedule A to see what adjustments show there. It's the amounts that were used to reduce your federal taxable income. It could also be deductions you took for other things that reduce your federal income even if you did not itemize. That could be things on lines 23-36 of your 1040. I'll post here instructions on how to view just your 1040 without paying, and instructions on how to contact us by phone if you need more help than we can give you here, since we can't see your return and they can.
