If they have no direct deposit info for you from your 2019 tax but you filed you can use the portal that they will release this Friday on the 17th. If you haven't filed at all you can use the portal that's up now. If they have DD info for you from this year but it's wrong, I've heard that you will be able to update it at a later date, but am not 100% as I've heard conflicting info that if they've already attempted a deposit and it was rejected you'll automatically have a check generated to be mailed
