After you file

I cannot see what screen you are looking at, but if it's asking  you to choose between "direct deposit" or the "TurboTax Prepaid Debit Card" you recently applied for, then if you wish to use your pre-existing prepaid debit card instead, you would choose "direct deposit" and then customize it.  A deposit onto a pre-existing prepaid debit card IS a direct deposit because it uses an underlying bank routing and account number.

See these instructions on how to set up direct deposit to a pre-existing prepaid debit card:

First, make sure your pre-existing prepaid debit card is still valid and active.  Then get your card's underlying bank account and routing numbers specific for your card.   Either contact your card's Customer Service, or log into your online card account to verify the card is still good and to get the banking numbers.  Be sure you have the right bank account and routing numbers for your card.  They will differ from the card number shown on the card.   Do not use the number on the card.

Ask your card's Customer Service if they accept a direct deposit of tax refunds from the IRS.  Some prepaid debit cards might not, or may have limits on the amount that can be deposited from a tax refund.  You can ask your card's Customer Service about that, or perhaps there is information on that topic in the FAQs on your card's website.

When the TurboTax program asks you how you want to get your Federal refund, choose "direct deposit".  You will enter the bank account and routing numbers specific to your card, and indicate that it is a "checking" account.

You'll also need to know and enter the name of the underlying bank that the routing and account numbers were for.   Ask your Card's Customer Service or check the FAQs on their website.