Retirement tax questions

I only have my original 1099 R from the original distribution in 2020 for the Cares Act.  I now need to claim the 1/3 portion of the distribution for 2021.  How do I do this? The program keeps stating to complete the 1099 R section in income.  I only have the original distribution amount,  There is no drop down to code as cares act.  I'm totally lost and need to get this done.  Please help.