If you are using TurboTax Online, you can get back to that page by using the Find tool (magnifying glass) to search for “direct”. Then pick “Direct Deposit Information For [Your Name]” and click the Go button.
Please note that if you change your direct deposit information using your tax return, you will have to print & mail your return. So it’s best to do it through the CRA if you want to NETFILE.
This CRA page has info on how you can update your direct deposit account information: https://www.canada.ca/en/revenue-agency/services/about-canada-revenue-agency-cra/direct-deposit/frequently-asked-questions-about-direct-deposit.html