How do I get an advance through turbo tax for my taxes?

TurboTax is not offering a 2024 tax refund advance at this time.  If it is offered in will not be until after January 1, 2025.  You cannot request the refund advance, it will only be offered to you if you are eligible.

The Advance Refund loan won't be available until after January 1 and just when you are ready to file. And only if they offered it to you.  You can't self select it. Then you don't get it until AFTER your efile is Accepted by the IRS.
https://turbotax.intuit.com/refund-advance/