Another way of saying it is, drag the file to the sdcard folder, don't nest it in any of the other folders. Try to find some newbie guides even if it's for different phones, don't use those practices but read up. Sometimes stuff like that isn't clear by devs since they have been doing it for so long, to them it's common sense.
The root of the sd card is where all the folder stay don't place the file in a folder ...so think of you house as the sd card and the bed rooms and bath room as folders just drop it in the door... i hope this helps
Like said above. Root is just another word for the main/home directory of your sdcard. When you just put a file loose on your sdcard you are putting it into the root(main directory) of your sdcard.
Be careful with the leak though. You may want to wait til its official. There are problems with heat and battery drain with the leak, due to the kernel being throttled to max speed when screen is on. I have not installed the leak.