To drag the map, left click on the map and move the mouse while holding down the left mouse button. You should see the "little hand" cursor close as it grabs hold of the map and open as you release the button (doesn't always open but what can we do:-).
Move the map to center over the required position. The Center Latitude and Longitude boxes above the map will change when you release the map. Try it now on the map to the right.
You can also click on the left, right or up and down arrows to pan the map, but it is easier to drag the map as described above.