IF you have the 'patented' fix hard pipe drain system then here is a post with details.........
LINKIf you have the fixed macerator system.......haven't got a clue.
ON EDIT: Found this info on macerator system
" You had to remove a protective cover held on with a couple of sheet metal screws over the macerator. The connection of the hose was just like a washing machine drain hose. You just pushed it on and held it with an adjustable pipe clamp"