If you have already filed your tax return, it may be too late to add Direct Deposit for this filing. As you must contact CRA directly to add or change Direct Deposit information for your tax refund or other benefits, we suggest you contact them immediately and enquire if the option can still be added for this refund.
Please see this link for ways to sign up or change your Direct Deposit with CRA and Frequently Asked Questions as well: CRA Direct Deposit
Are you completing a US return or a Canadian return? If a Canadian return and you live in Canada then you probably clicked on the TurboTax US instead of Canada and if that is the case you will need to go to the following TurboTax Canadian site to start your return over again- www.turbotax.ca
Thank you for choosing TurboTax.