Look at your most recent tax return (2018 or 2019) to find the direct deposit information that the IRS has. You can find it on form 1040 near the signature line or on the filing instructions prepared by TurboTax. If it is correct, you don't need to do anything.
If you have not filed a tax return in the last two years, you can use this web site to enter direct deposit information: https://turbotax.intuit.com/stimulus-check/
If it is not correct or if there is no direct deposit information on the tax return, you will need to wait for the IRS to open up a portal for you to enter it online. It is expected soon. Use this to track it: https://www.irs.gov/newsroom/economic-impact-payments-what-you-need-to-know
