Ford Focus - Ford CD6000 Clock reset - quoasis

My Battery was recently taken out & this reset the clock (of course). The problem I'm having is that when I reset the clock it fails to save the new time & date as when I come out of the menu it goes back to the old time. The manual says to save it by pressing the "clock button" but I don't have one of these, I have a "phone" one instead and pressing that just mute's the radio! (it's the CD6000 with the central volume knob).