1) Remove the screws holding the bumper in place. There are two screws on each side of the bumper, located in the wheel well. To remove the screws, use a Phillips head screwdriver.
2) Once the screws are removed, pull the bumper straight back to detach it from the vehicle. There may be some resistance due to the bumper clips, but you should be able to pull it off with a firm tug.
3) After the bumper is removed, disconnect any electrical connections that may be attached to the bumper.
Reinstallation is the reverse of removal.