If the gift was $18,000 or more then you have to complete IRS Form 709 to report the gift given. There will not be any gift taxes owed if your total of all gifts ever give is less than $13 million.
TurboTax does not support Form 709.
Go to this IRS website for the Form 709 and instructions - https://www.irs.gov/forms-pubs/about-form-709