There are Help articles. Example:

https://proconnect.intuit.com/community/retirement-tax-credits-and-deductions/help/entering-a-conver...

The nondeductible is part of Basis.

1. if you can see the line that you want to make an entry on while you Check Return, Click on it and generally it will take you to the input

2. at the top of the left column is a search box - use a simple word, or very short phrase or a form

3. For this where you enter the 1099R, click details in the upper right and you should be able to find what is here

@BJVM980066 You now have posted under ProSeries and ProConnect. It helps to be specific for which program you are using. Thanks.