That X is indicating to TurboTax to direct deposit your refund into the account. And since you do not have a refund, you have errors on your tax return. As mentioned above, the 1040 worksheet is not the place to enter your direct debit info to pay your tax bill. You can go back an uncheck that box and remove your bank account from the 1040 worksheet.
You can change your filing method from ''by mail' to ''e-file'' AND enter your direct debit information by using the File tab up top, see image attached. Once you click on 'File', you can choose E-file, then a few screens later you will be asked for payment info and you can enter your direct debit details.
