I don't what your situation is (refinance, sold & bought home, or lender sold mortgage) so I can't advise on how to enter your 1098s. I will assume you just need to know how to override the amount of deductible interest. After entering all 1098 data exactly as shown on the forms and selecting Done With Entering Mortgage Interest, you should eventually get to a screen that says something like Your Deduction Is Being Limited and and that's where there should be an option to enter the interest you calculated.
