You need to enter a negative number, since the credit would reduce your overpayment. A credit is a negative amount, that is.
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So maybe I didn't filled up the form correctly and it is probably not a credit. If I overpayed by 1130 last year(I payed the 6% fine) and this year reduced my contribution so that excess is no longer carried going forward in future, should I add 1130 to the amount I contributed this year and have that in the form?
At some point in the recent past the TurboTax developers changed TurboTax to automatically apply as a current-year Roth IRA contribution as much of an excess Roth IRA contribution carried into the current year as possible, so the entry in question is no longer needed. Simply delete the $1,130 entry.