How can I access what I entered for my 1099r forms. I believe I may have omitted a state tax amount withheld?

To edit your 1099-R, please return to the 1099-R data entry page on your Federal return, Wages & Income tab, then scroll down to IRA, 401(k), Pension Plan Withdrawals (1099-R) 

On the page Your 1099-R Entries, choose the Edit option next to the 1099-R you wish to review. 

What was not helpful about my answer?  

I can only access the filed 1040 tax form. I can’t access supporting materials.

It's important to note that you already filed your return.  In this case, you will need to manually add up the numbers from your 1099-R's and if the amount reported on your return is different and the IRS has already processed your return without correcting your withholding, then you will need to file an amendment.

I am not concerned about the federal numbers on the 1099-Rs.  I want to know if I entered a state tax withheld on one of the 1099-Rs.

@mahinjoho The state tax is entered on the Federal interview.