The student exchanges ink cartridges from the printer.
text: At the front open up the door thats at the back.
text: So at the front of printer that's another lock.
text: Just pull them backwards with quite some strenght.
text: Only  the black cartridges though.
text: Just put it backwards,dont push it.
text: Like pull it two fingers.
text: Pull it backwards.
text: Dont push on it but just take your two fingers and grab it with your two fingers the blacked out and the pull it backwards.
text: Look at the cartridges again.
text: And then put your fingers.
text: Exactly
text: And close the door.