Basically you set a trigger to track..spell cooldown for instance...and when the spell if available, a icon appears. So I have on set to track when Corruption is about to expire. I set it to pop up an icon when Corruption has 3 seconds or less left. When it pops up I have enough time to throw Corruption back up without it dropping off...so depending on lag I can keep my DoTs up while throwing out fire and what not.
I'm definitely not perfect at my rotation, but this addon has helped me to prioritize how I spam buttons


