Home Mortgage Interest worksheet

After entering all of my 1098 information and running the "Smart Check", TurboTax asks me enter the loan origination amount in the worksheet section of the Schedule to fix an error.

I open up the form and scroll down to the highlighted box and click on it, but it does NOT allow me to enter any data. I was able to enter missing data the same way to fix 2 other "errors" that were reported, but can't on this form for some reason.