As I said in my comment to the other other , you would be a non-resident alien for 5 calendar years.
You would need to file form 1040NR plus 8843. These are not supported by Turbotax.
You can file the correct forms or 2015, but you also need to a amend your return for the year you filed with Turbotax.
You would need to file form 1040NR plus 8843 plus form 1040X (the amendment form) for that year.
