Yes, as xmasbaby0 stated, if your return was already e-filed, you would need to wait for it to be processed before amending it.
Also, Form 1040-X for filing an amendment won't be available in TurboTax until February 23, 2023. See here for more information on forms availability.
See here for more information on preparing an amended return with TurboTax. Once you have begun the amendment process, return to the Rental section and enter the omitted expenses.
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