If a student is mistakenly checked-in by a teacher, you can simply go to the list of students who have been checked-in and tap on that particular student to check them out.

If you would like to undo the action or delete the action entirely, simply select that child from the homescreen and click on "Feed." 

Next, you'll tap on the action in their feed that you’d like to undo and either edit the time or delete the action altogether.

Related Articles:

"Attendance and marking students as absent"
"How do I move a student between rooms?"

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