I have two RMD's. One has a nontaxable portion. How do I input the nontaxable portion for that RMD in Turbo Tax Premier?

[MinhT1]

When you have entered all of the Form 1099-Rs that you received, you will be on the “Your 1099-R Entries” summary screen. 

Click Continue to move forward and answer more questions.  These questions will include things such as whether non-deductible contributions were made and tracked in previous years, IRA total basis, the value of all Traditional IRAs, and any other details needed to calculate the taxable amount of the distribution.