Thanks, peeps, but...........
There's definitely no format command in any of the menus. I looked for that first.
Do you mean delete the images? I can do that one image at a time in the camera. I've also experimented and popped the card into my PC, right clicked on files, then selected "delete". Both work OK to delete images. I could obviously delete all images.
But that's deleting, not formatting, isn't it? Or is it?