A 2023 tax return cannot be amended using the online editions. You will have to download one of the 2023 desktop editions and install on a personal computer. Then download the tax data file from the online account.
See this TurboTax support FAQ for amending a prior year tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-a...
