To remove the wiper arm/blade assembly, pull it away from the windshield glass while counteracting the tension of the wiper arm spring. Then, depress the small tab located below the wiper arm at the blade connector socket and detach the blade from the arm. In some cases, a coil spring blade retainer may be present, in which case you should insert a screwdriver on top of the spring and push downwards to remove the blade. To reinstall, simply reverse the removal process, ensuring that the connector is fully pushed onto the arm and that the small locating 'pip' securely fits into the hole in the connector.