Extruding a circle along a polyline to create 3d pipe?

Hello,

I am new to draft sight and kind of struggling with some of the commands and options.

I have had a little experience with autocad LT. My problem with extruding a circle along a

polyline is every time I try to extrude the circle to asks for a extrusion height. I was wondering how to get it to extrude along the path. I type in path but it goes right back to what is extrusion height.

Is there any options here? and Is there any tutorials that I can check out to learn more about dratsight?

Thanks, Richard