Afaik as long as you're actually in SEA then it will automatically detects it... Buuuuuut the thing is, IMHO, it's still broken. It shows SGD but when you reach the checkout where you will have to pay it will use USD conversion. For example when you add to cart Ghost Recon: Breakpoint Standard Edition it will show $56.69 instead of $59.99 but when you reached the checkout it will show right at the Subtotal $SGD=($USD Conversion of your local currency). It sucks I know but I still bought it anyway...