Turbo Tax does not support form 1042 S. Form 1042-S is used to report income paid to a non-resident. If you are a non-Resident alien, you need to file a 1040 NR. Turbo Tax does not support this form. However, Turbo Tax has partnered with Sprintax for assistance in preparing US tax returns by international filers. See https://www.sprintax.com/non-resident-alien-tax-1040nr-turbotax.html
If you are a resident alien and you have received a form 1042 S where you report the income depends on the income code and why the form was generated. See page 18 for a description of income codes https://www.irs.gov/pub/irs-pdf/i1042s.pdf.
