how to add a waypoint from a lat/long such as N 40 43.883' W 76 09.100'

I'm using 4.6.2 and want to add a point of interest, waypoint, or whatever the proper term is to an existing map/track.
I have the lat/long, such as N 40 43.883' W 76 09.100'
I can't figure out how to get Basecamp to let me use that as the address. This has to be easy and I'm just not looking in the right place

Thanks