"i am on it" means: - " I will do it right away"; or - " I am trying to do what you asked for."; or - " I'll take care of what you've ordered/asked me.

It means "I am aware of the problem, and I will take care of it immediately".

Hiiii Suzies , how are you ? i would like to wish you earlier " HaAaPPppYYYyy BiiirTHdayyYYY to YouUUU " wish you all the best ^^ keep in touch seee yaaaa byeeee :)))

lm doing what u told me to do

thank you. i had been unsure about that. now i get it.