If you are self-employed, you can fill out Schedule C on the tax return to claim income and deductions for your business.
On the top right of the screen, click On "Search", then enter Schedule C and hit enter on your keyboard.
You should then see the "Jump to Schedule C" link, click on this and you will be directed to this portion of the program. (screenshots attached)
You can select begin the interview process to enter information about your business.