You can either delete the Schedule C and remove the entire business. Or you can go back to Schedule C and change the name of your business. To go back, search for sch c and use the jump to link. Select the business and choose Edit.
Where do I enter Schedule C? You can also delete the entire Schedule C from there. Or use the delete a form tool instead, see below.
How to delete forms in TurboTax Online
How to delete forms in TurboTax Desktop