If your bank changed from the bank shown on your 2019 filed tax return, then you need to use an online portal that the IRS will put up in the next few days to change your direct deposit information. Here is a link to an IRS web site to follow: https://www.irs.gov/newsroom/economic-impact-payments-what-you-need-to-know
You can't make the change using TurboTax.
