using the ipad app

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Hello All, I am using the app and one of the features is the reminder. I set the reminder to notify me if I have not logged on by 8 at night. I can not get it to work. Anyone know how this works. Was using my fitness pal a few years ago and was doing great. Then got out of the habit of using and gained about 30 pounds...grrrr. I need to get back on track.