If you want to NETFILE your return, change your direct deposit info through the CRA’s My Account before you file: https://www.canada.ca/en/revenue-agency/services/e-services/e-services-individuals/account-individua...
You can also do this through TurboTax, but if you do, you will have to paper file your return.
In TurboTax Online, you can use the Find tool to search for “direct”, select Direct Deposit for [Your Name] from the list and click Go. Choose Yes from the options and click Continue. Choose Print and mail return and click Continue. Then enter your direct deposit info, and click Continue to save it and move on.
In TurboTax CD/Download, click on the Forms icon to go into Forms mode. Click on the Forms icon again and search for t1dd. Select it from the list & click Ok. Fill out the t1dd form and then go back to the interview by clicking the EasyStep icon.
This CRA (Canada Revenue Agency) page shows you how you can set up direct deposit: https://www.canada.ca/en/revenue-agency/services/about-canada-revenue-agency-cra/direct-deposit.html