Thank you for your help AmyC
I went through the online process (all the way to the end) and found that I can not use the online software to change the amount received. This is line 18 from Form 1040-X
18 Overpayment, if any, as shown on original return or as previously adjusted by the IRS . . . . . 1,840.
The actual amount I received from the IRS was $640, not $1840. Since I'm unable to change the line (from $1840 to $640), the process thinks I owe the IRS $553.
Perhaps I need to switch to and use Turbo Tax/CD download to make the modification and efile?
