What should I write line 18 on 1040x form if I didn’t get any refund from IRS from my reported original tax file overpayment amount for year 2017?

[egunal]

I did file with TurboTax for 2017 but I had a mistake on the federal withholdings because of this, I didn’t get my refund. This has been reported to me from IRS when I opened a case with them. Then they asked me to fill amended tax return form. Now I am filling amended tax return 1040x. But i but I have a question on refund or amount you owe part. Because the way 1040x, line 18 and the following lines are instructing give the new overpayment amount which is $155 but this amount is not actual amount that I need to get as refund with corrected info. My original overpayment report was $935, and corrected one have $1090, but according to form it’s showing up as only difference which is $155 as refund amount.but it supposed to be $1090.

[Critter]

Line 18 would be ZERO since you received zero refund to date.