How do I report how much I have left in my IRA on turbotax?

When I did the final check on my return a box popped up asking me the cost basis (?) of my IRA ( the amount that was left in it).  I then decided to check my form again to make sure I copied all of the numbers correctly in my return.  When I did I forgot about reporting how much was left in my IRA  and checked that I didn't want to do - that report how much I had left in my IRA. I had done a minimal distribution of my IRA.  I filed my tax form.  Now I'm thinking I'll have to amend it at some point. How do I get to that- telling how much I have in my IRA- on turbotax? I made this mistake a few years ago. I wasn't thinking clearly due to covid nerves. HELP!