The 2023 W-2 can only be entered on the 2023 tax return.
If you have filed a 2023 tax return then you will have to amend the return to add the W-2.
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...
