I just started to deal with this stuff, and i have still many doubts and difficulties. For example, i still couldn't understand how to download scenes from the rjdj website on my android phone, it seems you just can do this with an iphone. I hope anyone reading this thread has some useful hints :)
Well I didn't manage it either. But I have an iphone too so I downloaded it on my iphone, and then fetched the scene on it and copied it on my hard drive. Then transfered it back to the android phone. I think I'm not supposed to do as such as RJDJ is an app for iphone, it's not directly related to the Sceneplayer on android (I mean rjdj didn't developp it). So the content you find on rjdj website is not supposed to be used on an android phone I guess (except for the examples scenes it seems), if they someday release a rjdj app then they may add this possibility.