Remove wiper blade

Do you mean the wiper blade or the wiper arm?

The wiper blade should have a small tab or lever on the underside of the hinge where it attaches to the arm. Use a small screwdriver or a pick (etc..) to gently pry the lever upwards to pull the locking tab out of its corresponding hole on the wiper arm. Once the tab is up, firmly grasp the wiper blade and pull towards the base of the wiper arm. Sometimes they stick a little, just be careful not to bend the wiper arm.
If you are looking to remove the wiper arm, remove the plastic cap at the base of the wiper arm to gain access to the nut below. Using either a 13mm (1/2 inch) or 15mm socket (depending on the model) remove the nut by turning counter-clockwise. Once the nut is off, place your hand in the middle portion of the wiper arm and firmly push downward, being careful not to bend the arm. What you are trying to do is rock the arm off of the wiper motor stud. Be sure to mark where the wiper blade rests on the windshield before removing it, so you can reassemble it in the same spot when you put it back together. Use a grease pencil or something else that you can clean off later.
Hope this helps!