It looks as if Blackpoint uses Android, but what makes you think that there's any of installing apps on it? Not all smart TVs allow you to install apps, and many of those that do don't allow you to install apps from unknown sources (because if you brick the TV by installing an app not developed for it, it's user damage, so it's not covered by the warranty, and you'll get angry).
Look for a "Setup" app. If you can't find one, look for an "Advanced" app, and look in there for Setup. If you can't find either, you probably can't install apps from unknown sources.