To reach the question in TurboTax that asks for your basis in Roth IRA contributions, click the Continue button on the page that lists the Form 1099-R that you've entered.
Also, this is an early distribution, not a qualified distribution, requiring Form 8606 Part III to be included with your tax return to show the calculation of the taxable amount (which will be zero if the distribution was less than your contribution basis). TurboTax will automatically prepare Form 8606.
