How do I edit my refund to confirm that I have written evidence to verify by deduction for mileage?

I believe you're asking how to get to the point in your TurboTax interview where you confirmed that you kept track of the mileage that your vehicle was used, for business vs. personal usage.

If this is the case, open TurboTax Online and:

1. If you don’t see 2022 TAXES in the left pane, select the dropdown to the right of Wages & Income on the Hi, let’s keep working on your taxes! page and then select Let’s get started, Pick up where you left off, or Review/Edit. 
2. In the left pane, select Wages & Income.
3. Select  Review, Edit or Edit/Add to the right of Self-employment income and expenses
4. Select  Review  to the right of the relevant self-employment entry
5. Select  Edit to the right of the appropriate vehicle
6. On the Let's get some info about the miles you tracked for this [vehicle] in 2022 page, you can see which bullets you checked to verify that you kept track of the mileage.   When done, select Continue and proceed through the interview

If I misinterpreted your question, please provide more information.