To move around, click/tap along the dotted yellow lines painted on the ground. You can click anywhere along the lines, but you'll always only move one step at a time. So if you click far into the distance, you'll move in the direction of your click, but only one step forward.
To turn around without moving forward, click the white arrows below the image, or use your keyboard's left/right arrow keys.
To teleport to a point, click "Show Map" below the image. The yellow lines on the map show where you can go. Click anywhere and you'll be taken to the picture taken closest to where you clicked.
To retrace your steps, use the backspace key, or your browser's "back" button.
To exit this help press Escape or click on the "X" button in the upper right corner.