shapefile - How to calculate the Zone of Impact using OpenWind

After downloading OpenWind, I am trying to calculate the ZVI for a single Turbine. There is no documention regarding this from the developers.

At this point I just want to compare the output of the visibilty analysis i.e the Viewshed.

I have loaded my DGM and defined it as my Elevation layer with Properties>Interpretation>Terrain Elevation.

I have a point shapefile which contains a single location for a turbine. And this is where I get lost. How do I define the turbine specifications and let the software know that the point is the turbine location?

Thanks for any pointers,

yours,

Robert