nikon sb28

hello,anybody using nikon sb28?mine has stopped zooming with my zoom lens.i remember this can be switch off and on,on the screen but i can't remember how.i do have the manual somewhere but can't put my hands on it now.any help very welcomed.
thanks

I think you accidentally hit the zoom button setting the flash to a fixed focallenght. Without the extra "spreader" you can manually zoom it from 24 through 28, 35, 50, 70 to 85mm hitting it once again should make it zoom with your lens
Kind regards