You can change your refund method, as long as you haven't filed yet (or you e-filed but got rejected). Follow the instructions below.
Open your return in TurboTax.
Go to the File section in the left menu.
Next to Step 2: Your refund info select Revisit.
Choose your desired refund method and select Continue.
Unfortunately, once your e-filed return has been accepted or you already mailed it, it's too late to change your refund.