Where do i locate my account and routing number in the app? Or is there another way to get it?

In the File section of the program, after you have completed the tax return and have a federal tax refund or have federal taxes owed you can enter the bank routing and account number for a direct deposit or a direct debit.

Your banking information cannot be changed after your tax return has been filed and accepted.

Banking information does not go from TT to the IRS until you file your 2020 tax return and it s accepted.  You enter/change banking information in the FILE section before you file your 2020 return. Changing it on the TurboTax site does not do any good until you file your return.  If they manage to send out stimulus checks before you can change your information, we hope the IRS provides a way for you to change it with the IRS.  If your check goes to a wrong or closed account, it will be sent back to the IRS and then the IRS will mail a check to the address on your tax return.