You can't change the year. You have to start your 2023 tax return over from scratch in the 2023 software. Separately, as DoninGA said, you have to file an amended return for 2024 to remove the 2023 information that you entered and include only 2024 information.
The tag below your question says that you are using TurboTax Free Edition. There is no free filing for past years.
