I need to add i paid city taxes

Why do you think you need to dd it?

City withholding is shown in box 19 of your W-2 and is entered ("added") in TurboTax (TT) with your other W-2 info at the W-2 screen.

 If you made city estimated payments and/or paid a balance due, last year, 

In TurboTax (TT), enter at:

Federal Taxes Tab

Deductions & Credits

-Scroll down to: 

--Estimates & other taxes paid

   -Estimates

   -Other Income taxes