Life insurance surrender

I received a 1099-R from a life insurance company. It has box 2b checked that says "taxable amount not determined" My premiums paid in exceeds the distribution. I see that this would not be taxable per IRS regs. How do I enter the 1099 in turbo tax home and business and be able to account for box 2b being checked and enter the total of premiums paid to wash out the taxable gain?