Grab with your mouse (don't relase) or use the controls in the upper-left corner to scroll the map. Click on the "+" to zoom in (and "-" to zoom out). keep focusing and zooming until you find your exact location (includes even small towns). Beside the map mode, you can also use the satelite mode or combine the two in hybrid mode. To leave a message, click once with your mouse on the desired area. Then fill in the boxes and hit
the "Post" button!