Retirement tax questions

Distribution from non deductible IRA

Please help me

I got a distribution of a non-deductible IRA ($6k) in September 2023. The total basis was $4k contributed in 1995/1996. I got the 1099R form showing the 6K in box 1 and 2a, x in box 2b, code 7 in box 7 , x in box IRA/sep.simple.

i entered the info in turbo tax but i see no place to report the basis 4K. How to fill out the data in the turbo. Turbo has a track record of the basis.

Thanks