Any way to get key to cycle

Hi. I use this live for my casting…

/castsequence reset=target Curse of Agony, Corruption, Immolate

It works great but i whant the key in game to change some how so i easy can see if addon is active or not. When i use /cast for all the spells it change symbol but havent workt any good to using the line.

try this addon it is what I use to see the spells being cast so I can adjust timing of my macros