Use the address you want the IRS to use if they need to send you a letter or a check.
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
Specifically, your mailing address should be as @xmasbaby0 described, but your "State of Residence" in the Personal Info section of TT should be "Foreign or U.S. Possession", which is the last choice in the State of Residence drop-down window.
**Answers are correct to the best of my ability but do not constitute tax or legal advice.