Adding more colours to a gradiant

hi im not sure if you can do it in animate but i cant find a way to add another slider for a adding a new gradiant colour. if its in the manual can somebody please tell me witch page id like to read a bit about gradiants.
Thanks, Harley

p205 covers gradients but not really the part you are asking about.

Just click anywhere just below the gradient to add another one of the controller sliders which you can can change to different colours.