The display is a touchscreen in the center console. If I remember correctly, you tap the "display" button to the side of the screen until you're in the mode where it displays fuel economy and battery, and from there you use on-screen buttons to reset the counter or switch between consumption and energy flow views.
Stomping it off the line a few times should put some load on the battery, it relies on it for most low-speed acceleration. It's hard to have a sense for how quickly it should drain, but I expect that if you accelerate hard and are heavy on the regen a few times and you don't get a christmas tree on the dash, you're probably ok.