Thanks wpurcell; it worked!I now find myself in a slightly ridiculous situation. In the "Add to Panel" program, I saw something called "Indicator Applet Complete". I was pretty sure that I didn't need it ... but I was curious. So I clicked on it.
I now have: a) three wifi buttons b) two battery indicators c) three volume selectors d) a power button (that I don't think I had before --and don't need), and e) three digital clocks. I have no idea how to get rid of these extras ...