If you have filed a 2019 tax return and need to change or add your direct deposit information, see this IRS website - https://www.irs.gov/newsroom/economic-impact-payments-what-you-need-to-know
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.

i need to add my bank account so i can get my stimulus check. i do not owe nor do i get a refund so idk how to add my bank info since the get my payment requires either a refund amount or amount owed 

Good luck I paid the 30 dollars for the plus version just to be able to call them to ask because every time I tried to amend it asked me to pay so I did it still wouldn’t let me so I called they said they let me amend and further more I can’t get my 30 dollars back I’ve used TurboTax for a few years now but definitely not after this I saw your post so I thought I’d let you know so you don’t spend the money just to hear no!