J1 visiting scholar holder, resident alien, which forms to file to show the tax exemption under China-US treaty article 19?

I'm a J1 visiting scholar holder, 2015 is my third calendar year, then I became resident alien. But tax exemption still work under China-US treaty article 19. For the tax return, which forms I should file besides 1042-S and 1040 to show the tax exemption treaty? I find I can not do this in Turbo Tax. Thank you very much!