You can use a screw driver to pop the center cap off the wheel.
You should now be able to see the lug nuts.
Find the right size end on your 4-way that fits your lug nuts. Break them loose, but don't take them all the way off just yet.
Locate where your jack is at.
Now jack it up under the axle or frame if you have a car, make sure it's in a good place so it doesn't slip off and fall.
Pull your spare tire out.
Finish pulling your lug nuts off and your wheel can come off.
Now put your spare on and make sure you put your lug nuts back on the wheel just as tight or tighter.
You can now pop the center cap back on and you are good as new.