When you enter your 1099-B information at the bottom of that screen, (I'm referring to "desktop" TurboTax here), you have two additional paths you might take. One of these is "Guide me step by step" and it's in this branch that you're asked if you acquired your stock by one of the various employee stock incentive programs, like an ESPP, or RSUs, etc. Obviously you used this path because that's the only way to tell TurboTax about "fair market value."
Since you know exactly how much you paid for the stock and, I assume, the broker used that number on the 1099-B, you could simply enter the 1099-B exactly as it reads, and you're done. Or, you can modify the trade you entered using the guided interview and change that FMV figure. Either one will give you the exact same answer and show up in your income tax return in the exact same way.
