It's not quite as simple as "There's an aurora in your area", more that it'll alert you when there's significant event that could generate them. There's a graphic on that page that shows aurora forecast plots.

As for alerts, you can follow the 'subscribe' tab along the top bar. You can select a lot of alerts, but what you probably only really care about are the very high K-index alerts. When you get one, check that page and look at the aurora forecast, and if it's dipping into or close to your location it might be worth going outside and looking north.