How do you open the door in Club Penguin?

first you find the puffle O's and use the scissors to cut it. Then,you find the black puffle by the tree stomp and feed it puffle O's. Then,find the find the door klutzy the crab went into. Last,you take a puffle O and throw it in the pet door and your black puffle will get the puffle O then he will unlock the door and then you can get in.