If you were eligible for the Refund Advance program, you would have been prompted for that option when selecting your refund method.
There are certain qualifications for the refund, plus the amount of the advance (up to $1,000) was based upon the amount of refund you were receiving. (For example a $1,000 refund would have been eligible for an advance of $250 if the eligibility requirements were met.)
Here is a link with more information:
Turbo Tax Refund Advance