If you are trying to use the TurboTax online editions, the 2023 online editions are not currently available. They should be available in late November or early December.
If you purchased and downloaded the 2023 desktop editions, you must install the software on a personal computer, Windows or Mac.
Once installed and you have entered the 16 digit license code, start a New tax return. If you have the 2022 tax data file on your computer you will be shown a list of files that can be transferred to the 2023 return. Choose the 2022 tax file you want to transfer and Continue.