First remove Schedule C, then add Schedule F by following the steps below.
If you need to delete Schedule C in TurboTax Online:
1. Go to "My Account" in the top right corner
2. Select "Tools"
3. Under "Tools Center" select "Delete a Form"
4. Navigate to "Schedule C" and select "Delete" next to it
To Add Schedule F:
1. Select "Business" at the top of the screen
2. Choose "Continue", then "I'll choose what I work on"
3. Select "Visit All" next to "Farm Income and Expenses"
