Retirement tax questions

Thanks!

when I answer question one “yes” it comes up with another question and if I answer that it WAS part RMD it wants to know the amount of the RMD which I don’t know:

 

Tell us how much of the $23,427.30 David received applies to the RMD that needed to be taken out.
 
 
All of this distribution was an RMD
Part of this distribution was an RMD
  
 
 
Enter below how much of the $23,427.30 David received applies to the RMD.
 
 RMD Amount