If you could be more specific about your issue, we'll try to help.
If you have 'Taxable Amount Not Determined' TurboTax asks if the amount in Box 1 was taxable previously. Unless you know that after-tax contributions were made, it's all taxable. If you inherited an IRA, the plan would know if after-tax contributions were made and that would show in Box 5.
If your issue is RMD, when you enter your 1099-R, enter the Box 1 amount for 'RMD' and 'entire distribution is RMD'. Neither the IRS or TurboTax knows what your RMD should be. The IRS expects your plan administrator to insure that you take your RMD each year, so a penalty is rare and usually an exception is made.
@dshafer69
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