Can't find the preference menu

[Frank jones]

Hello everyone,

I have created a exterior outline of my house in Home designer 8.5.5.18 on a vista operating system. The problem that I am having is that my Terrain (the plot of the land that my house is on, I live in a suburb) is not a rectangle. I generated a line outline of it using the cad tools. All the lines connect and I want to make this the terrain outline, however when I right click on it I cannot change it to the terrain. I looked on line at the web site and found that I need to change something in the preference menu that is located under the edit menu. When I open up the edit menu-no preference menu.

What am I doing wrong?

Thanks in advance.

Frank