Enter the 1099 Form in the interview section.
TurboTax does not know which forms you have and relies on you to enter the information.
If you do not see your form specifically listed, you can either search for it within the program as follows:
Or you can scroll down on the income or deductions screen depending upon what type of 1099 Form it is, and select "All income" or "All tax breaks" to see additional forms and how to enter them in its respective category.