Well I rang up IHG and they instantly changed my account to my US address and I was able to register.
8,000 BONUS POINTS
When you stay your first night by May 31, 2016
1,000 bonus points if your first night is June 1--September 5
+12,000 BONUS POINTS
When you stay a total of 12 nights
+18,000 BONUS POINTS
When you stay a total of 24 nights
+20,000 BONUS POINTS
When you stay a total of 29 nights
+50,000 BONUS POINTS
When you stay a total of 44 nights
1,000 POINTS TO SHARE
When you stay 1 night by September 5, 2016
1 FREE NIGHT TO SHARE
When you stay 15 nights by September 5, 2016