I don’t think I can? Near as I can tell that plugin is only available to select, proven developers. If I’m wrong I’d appreciate a correction, but I don’t see any way to access it.
Besides, just going by the document, it isn’t quite what I’m looking for. I want to snap and save photos <i>in-game;</i> keeping photos to share outside of the game isn’t high on my priority list. Thanks for bringing it up, though.