On most of the cars I've owned (in UK) there is a cover on the end of the arm that lifts up exposing a threaded shaft that the arm is attached to. Undo the retaining nut and ease up the wiper arm. It may be tight as it is on a spline. You may need to tap it with a soft mallet to free it, or use some WD40 or similar. When replacing be careful to line it up on the spline in the correct place or you may not get the correct sweep on the windscreen (as we say here).
Replace wiper blade and carefully bend wiper arm so it makes good contact with windshield
The windshield wiper arm is held in place by a retaining clip. Hold the retaining clip in and the windshield wiper arm will come off. Put the new windshield wiper on and read lease the retaining clip.
How do I replace the windshield wiper switch?
NOTE: To prevent glass and/or paint damage, do not pry windshield wiper pivot arm from windshield wiper mounting arm and pivot shaft with metal or sharp tool. 1. Turn ignition switch to the ACC position. Turn turn signal and windshield wiper switch ON. Allow windshield wiper motor to move the windshield wiper mounting arm and pivot shafts three or four cycles, then turn off the turn signal and windshield wiper switch. This will place the windshield wiper mounting arm and pivot shafts in the park position. Turn ignition switch to the OFF position. 2. Remove the windshield wiper pivot arm and windshield wiper blade by first applying downward pressure on the windshield wiper pivot arm head, while holding the windshield wiper pivot arm. Then lift the windshield wiper pivot arm to the highest position and, using finger pressure only, grasp slide latch tab and slide latch out from under the windshield wiper pivot arm head. Remove windshield wiper pivot arm and windshield wiper blade assembly. 3. To remove the windshield wiper blade, insert a screwdriver into the slot provided at top of the windshield wiper blade frame, push down on spring lock and pull the windshield wiper blade from the windshield wiper mounting arm and pivot shaft . 4. Install the windshield wiper blade onto the new replacement windshield wiper pivot arm. See sources and related links below for replacement wiper blade information.
Replace the locking tab on top of the wiper
Use a set of pliers and pull the wiper arm off the stud down where it meets the hatch.
are you serious... life blade off windshield, unclip plastic fastener off the center of the wiper arm, remove wiper, replace in reverse order.
The wiper arm is attached to the pivot which is part of the wiper transmission, which in turn is attached to the wiper motor.
http://www.ehow.com/video_4936070_install-windshield-wiper-motor.html?pid=1&cp=1 (this is very informative video on how to remove and replace a windshield wiper motor)
Remove the wiring harness from the wiper motor. Remove the windshield wiper arm from the wiper motor. Remove the wiper motor retaining screws. Reverse the process to install the new wiper motor.
The wiper arm and blade go to a pivot shaft.