You can add money to your AppCard at one of the two AppCard Kiosk Stations on the Belk Library's 1st floor. Here is a video on it!  One is near the library service desk and the other is next to the Fox Popular Reading Room, beside the fireplace. There are also AppCard Kiosks available in the Student Union (2nd Floor Computer Lab) and in the Music Library located on the 2nd floor of the Hayes Music Center. Make sure when you add money to add it to your AppExpress account and not your meal plan.
You can additionally add increments of $50 or more using your credit card on AppalNet from the 'My AppalNet' tab > 'AppCard Online' > 'Click Here' > 'Deposit Now' (on left).