A Better Routeplanner (ABRP) for planning trips and charging with a Electric Vehicle - both home and in-car.
Visit their web site (see link above). Play around on the web browser, where there is easier access to the Support pages, and explore. Create a user account, test out a few routes, etc. There are also some good YouTube videos by 3rd party users that show some of the features. From there, migrating to the app on your phone/etc is easier; the web browser is the first place to go to learn (IMO) and get the basics down.
FWIW -- there are other sites/apps that work great, too. Personally, I actually like the built in route planning in PlugShare. And, with the latest update in the XC40 ... I think just setting yourself to use just EA chargers and driving you'll usually find that is all you need. EA chargers are robust enough in most parts of the USA that you can just let the car do the math for you.