I am not sure by your question if you have filed a tax return and you are actually amending it or if you are trying to change it before you have filed it. If you have already filed your tax return and are preparing an amendment you will have to wait until your return has been accepted.
Your parents may have to file their return by mailing it if you have already filed your tax return and you need to amend it.
If you are using TurboTax Desktop, after you enter your name in TurboTax the following screen asks "Do Any of these Apply to YOUR NAME?" And you will select "Another taxpayer can claim me on their tax return." and "Another Taxpayer will claim me in 2024." If you click on "Edit" after your name, you can review the screen and change this entry.
If you are using TurboTax Online you will do this, as DoninGA mentions above, by clicking on "My Info" on the left side of your TurboTax screen. You will see a screen that says "Let's check for some other situations" and you can select "Another Taxpayer can claim me as a dependent on their tax return"
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