Use the navigation elements on the top left of the map to zoom or move the map.
You can also move the map by moving the mouse over the map with the left mouse key held down.
For directions, click on "Directions" in the information bubble and enter your address in the "To here from" field:
For example:Bahnhofplatz 1a, 9000 St. Gallen
Exact directions are then shown underneath the map.