Can I go back to Day 1 and update attendance. I see we missed checking a student in , therefore the numbers for that day are not accurate.

No, there currently isn't a way for you to update attendance for past days. We'll get that functionality added in the future, but it's not there now.

I can update that for you. What is the name of the student that should have been checked in for day 1?

Hello, has this functionality been updated yet? 

Yes, you should be able to edit the attendance after the fact.