ColeenD3 is correct, you’ll need to amend using Form 1040X.
You note that you downloaded the form and the instructions. Amending by hand can be overwhelming, as you note, but, if you used a TurboTax product to create your original return, it’s really very easy.
Please see the TurboTax Help article "How to amend (change or correct) a return you already filed" for instruction on how to amend your previously-filed tax return.
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