I entered a wrong number in withheld taxes from 2023. How do I correct that? I haven’t been able to get back to it

You would need to amend the 2023 tax return that you filed to make changes to the 2023 tax return.

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-already-filed/L4VjJ9BA2_US_en_US?uid=ld1n99kr