It's easy - the map below will move and not the pointer, so when you hold down your left mouse button anywhere on the map, you will see a hand that moves the map around. Find your general location and place the pointer there by moving the map.
You can zoom in or out with the "+" and "-" tabs at the bar on the left side and the pointer will remain where you placed it. If you zoom in with the "+" option and the pointer is not in the right location, just move the map around again.
You can even pull the little man at the top of the bar right to your chosen location by holding down your left mouse button and putting the green circle at the tip of the pointer - it will show you the street view.
If that doesn't show your exact location, you can use the arrows to turn 360 degrees. If you need to "walk" down the street, just hit the forward arrow on the street view and it will move forward.
After you're satisfied with the finished display of your map, copy the text that shows in the yellow box above the map and send with your organization name and street address.