Custom line style

I have been trying to create a custom line style, a double line.

I can not find the style in the libray and I do not see how to make my own style.

I want to use it to make a layout for a building I am designing.

I have a pretty good baackground in CAD but I am just starting out with DraftSight.

I am using the Free version on a platform running Windows 7 Home.