You can't file a GST/HST return using TurboTax. This CRA page tells you all the ways to can file a GST/HST return:
billgallagher201
Returning Member
TCCPA
Returning Member
brittooms
New Member
David268
New Member
deretax
Returning Member
You have clicked a link to a site outside of the TurboTax Community. By clicking "Continue", you will leave the Community and be taken to that site instead.