Is this a serious question?
Most cars come with a car manual that will tell you how to do this.
You need a car jack and most all cars come with one. Locate the car jack hole on some cars... there is a specific place to put the jack that comes with the car. Sometimes it's on the side of the car, otherwise there will be a fairly obvious flat spot (or bump that exactly fits the jack that came with the car) on the axle. Be sure the emergency brake is on before jacking up the car.
Remove the hub cap if there is one. Then use the wrench tool to remove the nuts from the wheel. Turn counter clockwise on most wheels. They may be stuck but will come off with a bit of work.
Remove the wheel, put on a fresh on, and put the nuts back on then lower the car. Don't over tighten the nuts. You're done.
A faster solution: ask a guy to do it.