If you are not going to file a 2020 return are you asking about 2019? Did you file 2019 yet? You have to print and mail 2019. If you need to change 2019 return you need to use the Desktop program now.
How to finish a prior year online return
https://ttlc.intuit.com/community/prior-year-return/help/how-do-i-finish-a-prior-year-return-that-i-...
Or since you have to print and mail 2019 I suppose you could just hand write in the right Direct Deposit info on your 1040.
Or why do you need to change the Direct Deposit Info?
