How do I change the color and thickness of a shape's border?

For example, if I draw a rectangle, how do I change the color and thickness of the line/border of the rectangle?

Whenever I try and modify the stroke color in the Fill and Stoke inspector, it only changes the fill color.

Thanks much.

In the Stroke&Fill dialog, there are tabs to switch between stroke, fill and stroke style.

There's also a place to change the properties in the bottom left of the screen. Furthermore, if you hold shift and click a color, it will change the stroke instead of the fill.

Or right-click a color, choose Set Stroke.

You can find lots of guides and tutorials, even for beginners in this thread
viewtopic.php?f=11&t=2