Section 1256 options are reported on Form 6781. You can enter the form number in the search box in the upper right corner of your screen and click Jump to for navigation to enter the information. Or, in TurboTax Online, you can click on Tax Tools on the left and in the topic search, enter the form number. Click on the form to enter that area of the software.
The following article discusses how options transactions are reported on Form 6781: