How do I move around?
To walk around you can press arrow keys or W,A,S,D. To jump just press space. You can also move around by simply left clicking at a location. Your avatar will move to that point.
Can I fly?
To fly first press F key. This will hover your avatar, then use the arrow keys to or W,A,S,D. Press E key to fly higher or C to fly lower. To land press F key.