Hold down your left mouse button over the map and move your mouse to scroll in the direction you want to go.
Use the +/- buttons in the top left corner to zoom the map in or out. Alternatively you can use the scroll wheel on your mouse.
Click and drag the orange man from the top left corner of the map. Streets where you can activate Street View will be highlighted blue.
Drop the man onto one of these streets to activate Street View.
You can pan the view by holding the left button down and moving the mouse, move around by using the arrows on the white lines and zoom using the scroll wheel or buttons in the top left corner.
Cick the X in the top right corner when you are ready to return to the overhead map.