Lost option to recalculate AMT on turbotax online

I went offline to recalculate my 2015 AMT by hand. Now I can no longer find the popup window or section to recalculate the AMT section of my 2016 return I picked the option to not recalculate the AMT for my 2015 return. I tried removing the state return return as suggested in the advice but this did not bring back the option. How can I find this option now?