If you were eligible to receive the refund advance it would have been offered to you in the File section of the program. You cannot apply for the refund advance.
See this TurboTax support FAQ for the refund advance - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-refund/refund-advance/L52Mg0G5u_US_e...
