I'm trying to make a fireball that's about to land on an island, but I can't seem to be able to change the direction of the fireball. I'm using a sphere, and I'm using version 2.79. Can you help me out?
You can use wind. Add it by pressing SHift + A > Force Field > Wind
Just place it at whichever direction you want fire to flow then simply increase strength of wind and you are done.