Im having trouble creating a checkbox in excel that if a user clicks it - a
check mark is made or removed. I created the box with active X - but I cant
figure out what to change to make it functional.

As a follow up - how can I take a box that is checked and use it in a
formula.
(ie if checkbox 1 is checked then A1+B1 if not "n/a"

Thanks,
Yosef