When a return has been filed & accepted, you cannot add direct deposit information. The IRS is going to give taxpayers the chance to enter their own banking information. See the following:
The IRS does not have my direct deposit information. What can I do?
In the coming weeks, Treasury plans to develop a web-based portal for individuals to provide their banking information to the IRS online, so that individuals can receive payments immediately as opposed to checks in the mail.
https://www.irs.gov/newsroom/economic-impact-payments-what-you-need-to-know
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If you have not filed a 2019 return, or do not need to file a return, the TurboTax link below, is for anyone who has not filed a 2019 return or if you are not required to file a return, if you want to qualify for the stimulus money TurboTax just recently setup where you can file a simple return for the stimulus money. See the following, scroll down to What do I need to do to get my stimulus payment?, then If you don’t need to file your taxes this year
https://turbotax.intuit.com/stimulus-check/
