How do I edit my Schedule C?

While filling out my Schedule C form for rideshare work, I realized I made an error in one of the mileage fields. However, there is no "Back" button available while filling out the Schedule C. I tried leaving the program and re-entering, but it picked up the form from where I left off, so I just finished it. Now I'm trying to edit it and there is no obvious place to access it.

If I search within the application, there is a button that says "Go to Schedule C", but clicking it just takes me back to the self-employed work summary, and drilling into my rideshare-related info does not give me any options to edit the form I'm looking for.

As a last resort, I tried clearing my return and starting over, but even that won't work because I have already paid for filing.