Why must you itemize? Are you filing Married filing Separate and she itemized on her return?
How to change between the Standard Deduction and Itemized Deductions
https://ttlc.intuit.com/community/accessing/help/how-do-i-change-from-the-standard-deduction-to-item...
And you can switch to Forms Mode and open Schedule A to see. If it doesn't show Schedule A in the list on the left, Then click Open Forms box in the top of the column on the left. Open the US listing of forms
