Ford 1996 Windstar Manual page 274

Insert the tapered end of the jack handle behind the wheel
3.
cover of the tire to be changed and gently pry it off. When
you want to replace the wheel cover, simply align the valve
stem to the slot in the cover and press it back on.
Wheel cover removal
If you have the optional cast-aluminum wheels, remove the
wheel cap to gain access to the lug nuts. To remove the cap,
insert the tapered end of the jack handle behind the notch in
the wheel and gently pry the cap off. To replace it, press it back
on.
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