It is in the secret store room behind the filing cabinet in the detention room on Big Nate Island. You need the blue prints from Nate's locker in order to access the secret room.
The bell is on top of the school in big nate island
you need to get the bell ringer and ring the school bell to get them away.
by standing by the bell
Poptropica
You will find the bell ringer for the bell on top of the school. its hanging on the wall
Get the bell ringer.
Up of the school.
it's on Big Nate Island on top the school
The bell on Big Nate Island on poptropica is located on the top school building. To reach it when you have the clapper, you need to get rid of the seagull there. (see related question)
you ring the bell with the claper you got in the secret room.
Ring the school bell.
you ring the bell in the school you must find the ringer search walk through on big Nate on poptropicaa to find out more