Are you referring to the question that asks whether you disposed of any investment(s) in a qualified opportunity fund (QOF)? If the answer is No you do not have to answer the question. If you leave it blank the answer is assumed to be No. In TurboTax Online there is no way to check the No box. Just leave the question unanswered, and don't worry about it.
(If your answer would be Yes you could not use TurboTax to file your tax return. TurboTax does not support reporting of QOF investments.)