Does anyone have instructions for entering info on backdoor IRA -Roth in Turbotax? Opened nondeductible and reported last year. Converted this year. TT figures a penalty.

Not eligible for IRA or Roth - income. For backdoor Roth IRA  opened a non-deductible IRA  for wife in Jan 2018- reported it on 2017 return. Converted to  Roth  in Dec 18. Only IRA in her name. TurboTax  figures a penalty for her Roth conversion. Can someone help with how to enter this in TurboTax? Thanks!