Lift them up so the wiper arm is perpendicular to the ground. You will see a small tab on the back side of the wiper blade. Press it, and then pull the wiper down.
It should be released.
<span style='color:gray'><span style='font-family:Courier'>1995 e36 3 Series RIP
1999 e46 3 Series BURN IN HELL
2000 MR-S Roadster= Current</span></span>