Just pop them off, they snap back on pretty easily.
Answer posted by Aaron on December 12th, 2007
the keys are bounded at 3 places,
on the upper left,
on the bottom left,
and on the right,
slide something thin in to the bottom left and push to make the joint lose and,
at the same time try to lift up the bottom left of the key,
loosen the upper left also, and slide the key to the right to detach the key.
the keys are bounded at 3 places,
on the upper left,
on the bottom left,
and on the right,
slide something thin in to the bottom left and push to make the joint lose and,
at the same time try to lift up the bottom left of the key,
loosen the upper left also, and slide the key to the right to detach the key.