First, pull the entire wiper assembly up, so that they remain vertical.

Remove the old wiper blade You may need to pull the tab. Located in the picture to remove the old wiper.

Take the new wiper, and insert the arm through the appropriate hole, so that it pushes the actual wiper up.

To determine which hole it goes through, adjust the hinge to be perpendicular to the wiper and line it up so that the arm's hook will go over the hinge.

Once the arm is inside the hole, just line the hook over the hinge and push them together. You'l feel a click when it's snapped in. Lower the arm, repeat for the other side and your done!