How to enter limited mortgage deduction

I know my mortgage interest deduction is limited to less than what is reported in my 1098. How and where do I enter the lower amount.  The Home Mortgage Interest Worksheet just says enter the amount in the 1098, but there is no place to reduce it.  You can say your interest is different than the 1098, but the worksheet assumes you paid more not less.

 

What is the right way to do this? Either in Turbotax or in a form or worksheet.

 

Thanks!