Here is a link to training trips. You can see a video in the tv screen of dogs learning how to reload the balls into the launching part. There are some other tips if you scroll down a little.
It's really great! I really want to work with her more so that we can use it. I play a real lot with Katie, but I have to get her interested in the tennis balls. Right now she snubs any ball that's not a small rubber bouncy ball. At one point all she would play with is these tiny rubber balls and a little tug of war, but now she's actually plays with toys, too. Katie will even start bouncing her balls in hard to reach places, such as under the baseboards, and then makes it a game trying to solve how to ricochet them out.
Training Tips - iFetch Pet Toy - Automatic Ball Launcher