Last time i told you to go to stream and take pictures from there.
For that you don't even need F12.You just press Prt Scr* button next to Scroll lock.
Then you go to some picture editing program like Paint or Photoshop and press Paste.Then you simply upload picture...
PS: Prt Scr* No,that button won't lead you to some private photo session of Paladins of the Round Table