Put a quarter size of mousse in your hand. While your hair is still wet flip your head over and run the mousse thru your hair. Scrunch your hair while still upside down.
Put your hair in a bun and blow dry your hair while it's still in the bun! thats what i used to do!
Section your hair and then scrunch the moose in each individual section. Then flip your hair upside down and scrunch more in. That will give you more volume.