If you have filed your tax return for 2019, received a refund and had the refund directly deposited in to your bank account, the Stimulus Check will also be deposited into the same account.
There is nothing more you need to do.
If you had a balance due, the IRS is setting up a portal where you can enter your bank information to receive the Stimulus Payment as a direct deposit.
Currently this portal is not available, it is expected to be available later this month.
If you are not required to file a tax return, you can register your information at the web site below.
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Please read what it says on the right hand side where it says “Filers: Get Your Payment”