The moodagent feature is where most of the magic happens. You can access this feature from the explore view (magnifying glass) or by pressing the moodagent button in the middle of the navigation bar.
For example, when you open the moodagent feature for the first time, it will be empty. By adjusting one of the Mood sliders, a list of tracks will be generated. If you adjust another slider, a different list of tracks will be generated.
Once you've found your favorite list of tracks, you can save the moodagent for later use, or save a playlist. A saved moodagent can be opened from your library, should you want to experiment further with it.