If you have not filed, to enter your business income and related expenses, please follow these steps:
In the TurboTax Self-Employed online version,
1. Sign into your account and select Take me to my return
2. At the right upper corner, in the search box, type in schedule c and Enter
3. Select Jump to schedule c
4. On the screen, Tell us the type of self-employment work you do, follow prompts to enter info.