As @VolvoGirl mentioned, filing an amended return assumes that the refund as per the original return has been issued. You should not attempt to amend a return in TurboTax if a refund is still in process.
If you have just filed your returns, you need to wait to amend them (if needed) until the original Federal return has been processed by the IRS (refund issued / payment processed). Wait until the State return has been processed by your State tax agency before amending the State return.
Once you have confirmed that the Federal return has been processed, if you used TurboTax Online, and you still wish to amend your return for another reason, log in to your account and select “Amend a return that was filed and accepted.”
See here for more information on preparing an amended return with TurboTax.
When you receive your refund, if you believe you will owe taxes for 2024, you can always adjust your withholding if you have a W-2 job or other income that has taxes withheld, make quarterly estimated payments, or make a payment at any time using IRS Direct Pay.
You can choose to prepare new vouchers for 2024 in TurboTax if you want to pay a higher amount quarterly, even if the amount you are already planning to pay is enough to avoid a penalty.
You can also plan estimated payments to your state using TurboTax. See this article for details.
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