Rear Wiper Blade P38

Hi all !
Proberly a really stupid question,but can anyone advise me how to change the rear wiper blade on a 97 P38? Ive sussed that the wiper stops by opening the tailgate.But the arm does'nt seem to be spring loaded(like fronts) and cant see a way of sliding the blade out of the arm whilst in "normal" position...
Am i missing something totally obvious?

Many Thanks in advance Tel

No, just switch the rear wiper on and hit the tailgate open button when it is 1/2 way down the screen,it will stop and allow you to change the blade.

Cheers Eightinavee Now its in that position i can see the spring pivot point is seized,which was stopping me get the blade far enougth off the screen to change.... Many Thanks Tel