The American Opportunity Credit is only good for the first four years of post-secondary education, so your dependent will not qualify for that credit (regardless of the country where he/she attended university).
However, the Lifetime Learning Credit is available for graduate school, as is the Tuition & Fees Deduction. TurboTax will calculate which benefit is more advantageous for you (you cannot claim both), based on your entries.
You'll enter the qualified education expenses by following the path Federal Taxes > Deductions & Credits > Education > Expenses & Scholarships (Form 1098-T).
