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I'm having trouble finding lines 12 or 13 having anything doing with withholding or taxes paid on an IRS form 1040 for 2019...or any of the previous 3 tax years. 

.......should be lines 17 & 18d of the 2019 IRS/Federal form 1040.....OR maybe you are talking about some state form 1040, since some states use "1040" as a part of their form names too  (Iowa uses IA-1040)

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In either case...check the following

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One place to check the TTX forms for where you entered the refund from 2018 applied to 2019 taxes (if those are the years you are dealing with)

If you have saved a PDF copy...for your records, with all forms and worksheets (not just the bare tax return)...in that PDF file, there is a Tax Payments Worksheet.  

a)  Total of all W-2 withholding is on line 10 of that worksheet.

b)  The 2018 refund carried to 2019 should be on line 6 of that worksheet.   

But.....IF you entered it at some other location, you should see where it is on that worksheet.
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For example: 

c)  If you accidentally entered that 2018 carryover during the interview as "Other withholding", then it will show up on one of lines 18a,b, or c on that worksheet.  And for a Federal form 1040 , it will total into line 17 of the actual Federal Form 1040.   (but if you talking about a state form and state refund carryover from 2018 in the State column of  that Tax Payments worksheet...then it goes to whatever line is appropriate on the state form)

d) IF you properly entered the Federal 2018 carryover to 2019 in the tax software, then that shows up on line 6 of the worksheet......and that would then add-in to , line 18d on the Federal/IRS form 1040, (along with a couple other estimated payment types, but not withholding).  Or if in the state column for line 6 on the worksheet....that goes to the appropriate place on your state form.