If you have already e-filed your return and it was accepted, you will be unable to change your refund method from US mail to direct deposit. 

If you have NOT already e-filed your return, please see the steps listed below on how to revisit your refund options: 

Go to www.TurboTax.com

• Log into TurboTax Online
• Click the box Take Me to My Return
• Select Pick up where I left off
• Select File towards the upper right side of your screen

Here will be the 3 steps to file your return. In Step 2 you should see "Revisit" in blue that you can click and it will take you to where you can change your banking information. (see picture below)