You sell dragonstones, then on a differant account mith ores (Account you want the money on), and then buy the dragonstones on that account. (All this is at the tzharr shop).
I won't go into more detail because honestly, I've done the math, it's not great Xfering at all...last time I checked for every 1m you xfered you lose 450k...so unless your willing to lose that much, I wouldn't use it.