Finding your grid square is easy with the map.
This will make it easier to see the map grid and zoom in on your location.
3rd. Use your mouse wheel to zoom in on the map. As you zoom you will see the resolution of the map increase and the grid squares will also increase in resolution.
You generally only need the first 6 characters for a grid square, maybe 8 if you live really close to someone and you want your QTH to spot differently from your neighbours QTH