If you are not required to file a tax return for 2018 or 2019, you can register your information at this web site
Everything to help you get your stimulus check as soon as possible
If you did file a tax return for 2018 or 2019, or both and you received a refund on your tax return, the Stimulus payment will be directly deposited to your bank account.
If you have a balance due on your tax return, the IRS is setting up a portal where you can enter your bank information to receive the Stimulus Payment as a direct deposit.
Economic Impact Payments
Currently this portal is not available, it is expected to be available later this month.
@Maleishah