There is a step-by-step guide available to help you report a back door Roth contribution. Essentially, you would first report the non-deductible Traditional IRA contribution and then enter the details from the Form 1099-R answering the follow-up questions to say that the distribution was converted to a Roth IRA.
For the details, see the following TurboTax help article:
How do I enter a backdoor Roth IRA conversion?
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