Wiper blades have different construction; yet, the general replacing scheme is pretty much the same for Toyota wiper blade and Renault one, for example. These are the simple steps to go: 1. Take the blade in your hands and put it perpendicular to the holder arm. At the fixation mechanism, there’s a release trigger (some wipers don’t have it, so you just skip pressing it). 2. Press the trigger and pull the wiper downwards. Don’t pluck too hard but firmly pull.  3. Return the wiper into the parallel position and remove it completely (it should slide away easily now). 4. Do the process in reverse for installing a new wiper blade. Put it parallel and insert into the holder, turn perpendicular, and pull up. The lock should make a click showing it’s there. Test the wipers running them on a good speed across the windshield with some water or cleansing essence on.