Schedule SE - the schedule that computes the self-employment tax - is created
automatically by TurboTax when you complete Schedule C (that is, a business).
You do not need to do anything to create a Schedule SE other than to enter a business that shows a profit of at least $400.
Note that using TurboTax Self-Employed will allow you to deduct ordinary and reasonable business expenses, which reduces your net income from your business, and, hence, your self-employment tax.