lump sum SSA payment

I completed my taxes with Turbo Tax Premier and my form included an SSA lump sum payment. Turbo Tax calculated the amounts correctly, but did not check the checkbox for a "lump sum payment". This resulted in the IRS incorrectly re-calculating my taxes and demanding additional payment. I found the error, but was unable to get turbo tax to check the checkbox. Does anyone know how to correct this? (I now have to file an amended return are several IRS phone calls and payment levies.

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