Hello there! I have done this too! The problem is when you go to where you put the modpack download link is, you have to change a little of the dropbox link like this https://www.dropbox.com/s/92v6kb4w662plqt/-{[MODPACK]}- EnderMagic.zip?dl=1. If you didn't see what I changed, I changed the 0 at the end to a 1, then you put that code in the "where to find the modpack area". Hope this helped! I did kinda explain it bad. Sorry.