The itemized or standard deduction line?   You shouldn't need to fill any of this in yourself, the program does it for you if you follow the instructions to amend a return properly.

First, change the tax return back to the way it was when you originally filed, then follow these instructions to amend a return.
https://ttlc.intuit.com/questions/1894381-how-to-amend-change-or-correct-a-return-you-already-filed