It depends. If you are trying to add a Schedule C to your return you can do that by using the steps below. This form is for subcontract or independent work as a non-employee.
If you are using TurboTax Desktop or TurboTax Online you can use the steps below:
You do not have to "find" the forms when you are using online TurboTax. All of your information is entered via the interview screens. You do not have direct access to the forms or schedules.
If you are entering self-employment income, your business expenses go on a Schedule C.