Eos 3 Can't change focus point selection

Hi all,

I am having a problem changing the focusing point selection on my eos3. The instructions say to push the button which is located on the back right hand corner of the camera, then turn the dial on the top or back (depending on how it's set up in the CF). It should be that simple, it works fine on my eos 5d. When I press that button I get the letters AF then it flicks back to the little picture showing the focal points. I have tried everything and been through the manual thoroughly. Any help would be appreciated,

Jason

Have you got the eye controlled focus switched on? You can't select a focus point when it is.