If there is a refundable credit, the Canada Revenue Agency will mail it to the address noted on the tax return. You can put in a note with your tax return if you want.
TurboTax offers the software to do your taxes; as a non-resident, you have the option of entering your residency status at the beginning of your tax return, as well as enter an address outside of Canada, once you have completed your tax return you will choose the "Print&Mail" to the (CRA) Canada Revenue Agency option.
For more information on filing a non-resident tax return, please see links provided below: