I have somehow ended up with a coordinate system for my assembly that is not where I want it.  (Let's defer the question of how it got where it is.  The first component added to the assembly had an origin where I wanted the assembly origin; I thought that would do the trick.  Anyhow I don't want to re-create the assembly now.)  There are the following instructions in SW help on how to move a coordinate system:

"To translate a coordinate system to a new location:

1.   Click Coordinate System  (Reference Geometry toolbar) or Insert > Reference Geometry > Coordinate System .
2. Define the coordinate system at a location on the part or assembly that provides the entities you need to control the angle and direction of each axis.
3. Click in Origin, then select the point or vertex to which you want to translate the origin.
4. Click ."

My problem is that I don't understand step (3).  Once I have placed a new coordinate system (or selected an old one) where I want the assembly's coordinate system to be, how do I then move the latter to the former? -- John Willett