In normal view mode, the top center button always moves you forward in the direction indicated below the picture. If you can move forward, the button will include the word "MOVE". Pressing arrows pointing in other directions will rotate your point of view in that direction. If there's no picture for a given direction, the button will be dimmed to light red (or gray, depending on your monitor).

Clicking "overview" will display pictures for all available directions on one screen. In overview mode, clicking on the arrows will rotate the view so the selected direction is at the top of the screen. To move, click on the picture itself, or return to normal view and click on the move arrow.