Did you click that big orange button that said “Transmit my return now?” If you did that, you cannot do anything to fix it yet. You have to wait for the email that tells you if your return was accepted or rejected. The IRS will begin to accept/reject e-files on January 29, so your email will come on or after 1-29.
You cannot change or add anything on the return that you just e-filed, nor can you stop it. It is too late, just like when you put an envelope in a US mailbox on the corner. The IRS does not allow you to take it back.
If you left out a W-2, a 1099G, or a dependent, or a 1099 etc…DO NOT change your return while it is “pending.” The changes will go nowhere.
Now you have to wait until the IRS either rejects or accepts your return. If your return is rejected, you will be able to go into your account and make the necessary changes to your tax return and re-submit your return.
If the IRS accepts your return, however, then you have to wait longer until it has been fully processed and you have received your refund. THEN you can prepare an amended tax return and e-file or mail it in. You have to be able to work from that return exactly the way it was when it was e-filed originally. You will need to use a form called a 1040X.
Meanwhile, DO NOT go in and start changing anything on your return in the system, or you will make a mess for yourself. Sit tight and wait until you see what the IRS does with the return you just e-filed
In addition to the advice provided by @xmasbaby0 above, see this tool for information about the availability of forms in TurboTax. As of now, Form 1040X for amended returns is projected to become available on February 14, 2024, subject to change.
See here for more information on preparing an amended return with TurboTax.
There are times when you should amend your return and times when you shouldn't. Here are some common situations that call for an amendment:
See this article for more information on filing an amended return.