How do I amend my 2023 Tax Return in Turbo Tax Free edition? My federal return was accepted but I do not see a link to 'amend' it.

Why do you need to amend?  The Form 1040-X will not be available until 02/14/2024

You will have to wait for the IRS to either Accept or Reject your filed federal tax return.
If the return is rejected you can make the necessary changes and e-file again.
If the return is accepted you will have to amend your original tax return. An amended return, Form 1040-X, can only be printed and mailed to the IRS if the original tax return was not e-filed. The IRS will take up to 20 weeks or longer to process an amended tax return.

Before starting to amend the tax return, wait for the tax refund to be received or the taxes due to be paid and processed by the IRS.

See this TurboTax support FAQ for amending a tax return - https://ttlc.intuit.com/turbotax-support/en-us/help-article/tax-return/amend-change-correct-return-already-filed/L4VjJ9BA2_US_en_US

You cannot amend it yet.   First you have to wait for it to be fully processed by the IRS.  Then wait for the 1040X to become available for 2023 returns.  That likely will not happen until late February.