Standard Mileage Deduction

Can anyone please help me find out where to edit for standard mileage deduction. I noticed the question about mileage didn't come up when I was entering rideshare info (no we didn't get a 1099) and thought it would come up somewhere else, and it did...on the final review, where I entered the wrong number and now when i go to deductions, it shows absolutely nothing for common deductions and everything for less common. I called Turbo Tax yesterday and the woman I spoke with kept thinking it was a contractor issue or that I should have a 1099 and subsequently I was told I needed a TAX EXPERT, WHICH I DON'T I NEED TO EDIT AND EVEN BE ABLE TO ADD MY ENTRY. Is anyone else having this issue? Also ironically, using Turbo tax through the Lyft app...so.