Remove them by lifting them up so they bend at the hinge at the base and pull the little tab at the base to lock them in that position, you might need a screw driver to move the tab. Then pull straight off. Without the wiper arms on the vehicle see if the motor turns the wiper mechanism. If it does, turn off the wipers so they home to the correct position then reinstall the wiper arms. If the motor doesn't turn the mechanism check for any obstructions or any loose/damaged connections in the mechanism.