Automation sending email

[shianreon2002]

Hi,
I am new to the channel and quite new user for Appsheet. I am sorry if I used the incorrect terms or created the thread in the wrong place.
I try to do receive email 7 days before due date, I can receive the mail when I press the (RUN) button, but can’t automatically received the time I set, where should I check? thanks for help.