Buick 1994 Roadmaster Owner's Manual page 215

Put the flat end into the notch and carefully pry off the
small cover.
Now
you
are ready to start using the jack and
wheel
wrench to raise your vehicle.
Remove the lock nut by inserting the key wrench into
the hole in the center
of
the wheel cover and turn it
counterclockwise to loosen the lock nut completely. The
wheel cover 'can be removed by hand
--
do not pry it off.