Newbie Help With Markers

[D_Boone]

New to web site construction (my second site) and its for my employer. I have been struggling with these map api's. The map is up and the marker is also, but the address doesn't show up with yahoo, so the marker is not in the right place. I centered the map on lon/lat. So, is there any way to place the marker with lon/lat? Any help would be great.

Thanks,
D