on the handle as you press the two sides of the clip and lift.  Unless there is problem, it should come off.

I just checked mine. The directions read:

"Lay unit on top of cleaner, lift handle on cleaner and press down unit. To remove, lift handle, press both sides of spring and lift up.  Press tools on unit as indicated by name on top side."

Hope this helps.  I have two XXX's and love them.

Greg F.