You cannot
change your refund method after you have e-filed or mailed your tax return.
If you need to
change your refund
method prior to e-filing or mailing your tax return, please visit the File tab on
the left side of the TurboTax screen. Navigate to Step 2 to select the refund method which are Direct
deposit(this option will allow you to enter your bank account and routing
number),Paper check ,Turbo Prepaid Card, and Split my refund between multiple
bank accounts or U.S. savings bonds option.
Note: If you
don't see the File tab, scroll to bottom of Home page, click Add a State(you're not actually adding a state, this just gets
you into the right menu) and then proceed with the steps above.
As long as you haven't already mailed your 2018 paper return, you can switch to the e-filing method (through October 15, 2019. Please see this TurboTax FAQ, How do I change from mail to e-file in TurboTax Online?https://ttlc.intuit.com/replies/5561257