Northeastern's payment instructions are here: http://www.northeastern.edu/financia...s/payment.html
You can pay by wire transfer, credit card, check or money order. Check the fees and exchange rate you'd get from each mode of payment. I personally found wire transfer to be the most convenient, most secure and cheapest option to pay my tuition from a different country.
Credit cards and check might seem tempting at first but can turn out more expensive. Many colleges charge you an extra 2-3% if you pay by credit card because they'll have to pay this transaction fee to the credit card company. Checks can get expensive if you need a check drawn on an American bank account.