If you have gotten the blueprint by using Nate's locker combination at his locker, you can open the filing cabinet and enter the secret room. The missing bell clapper is hanging from the ceiling.
You use the stink bomb in the detention room after you deliberately go there by chewing gum. The stink bomb will scare off the teacher, and you can enter the secret room shown on the Blueprint from Nate's locker. (see related question)
You make the stink bomb. If you already have it, go get detention by chewing the gum. Use the stink bomb to get the teacher out of the room. Go in the file cabinet.
you poo on it
To get the teacher to leave in detention, you have to use a stink bomb. You can make one in the science lab. Mix blue and yellow chemicals, then heat them. You can use the stink bomb when you reach the detention room for chewing gum. You will also need the blueprint from Nate's locker.
You make a stink bomb on big nate island in poptropica.
You have to make a stink bomb.
drop the stink bomb
You are only in detention to get into the filing cabinet, which has a secret passage behind it. Before chewing gum to get detention, there are two things you need : a stink bomb and the blueprint from Nate's locker. (see related question)
Mix the yellow and the blue!
mix the blue and yellow
plant the stink bomb
you use the stink bomb wow