How do I know if I owe a penalty, how do I get to the correct TurboTax section?

When I went through TurboTax the first time, it said I owed a penalty for underpayment of withholding, and,  if I had retired in 2014 - which I did, request a penalty waiver. Now, I cannot find out how to get to this section, as well cannot find anywhere that ways I owe a penalty.  How do I get to correct TTax section that addresses this?