How do I fix the makeup despencer in the ghouls bathroom?

You unlock this through Frankie's episode, get through some of the mission , then (when prompted) the icoffin sends the message to fix it, go to the ghoul's bathroom, then match the coloured pipes from start to end, (Twist the remote to change direction) It may take many attempts as time drains quickly also with each time you retry the game, the coloured pipes change so match the pipes with the start and end which will be colour coded to indicate which pipes to use. Curved pipes are ideal for start and end and may need to be rotated. Honestly with this task it's about trial and error. Obviously the ghoul's bathroom is in coffin corridor, next to your locker.

To fix the fried makeup dispenser in the ghouls bathroom is very tricky. You have to see which color there is more of. Like if there is more yellow than any other colors that's the color you need to make a path out of from start to end. So you basically need to make a path out of one of the colored pipes. The path has to be the same color.