Retirement tax questions

@RobertB4444  You previously answered my question with the comment

 "and  explain why your 4th quarter payment is much larger." 
 I presume the purpose of that is to request a waiver of the late payment penalty.  
Where and how do I do that in TurboTax?
 
You did not respond.  Please advise where in TurboTax I can input my explanation.