You can't access the Filing Cabinet unless you have the Blueprint showing where the secret room is. Use Nate's combination to open his locker, and get the blueprint from the pile of papers. Now you can access the room below the filing cabinet.
you put the stinkbomb on the floor of the detention room and the teacher will leave then you click on the filing cabinet
You make the stink bomb. You get the bubble gum. You get the blueprint from Nate's locker. Then chew the gum. The teacher will take you into the Detention Room. Blow off your stink bomb. Teacher will go away. Click on the filing cabinet.
I am guessing you are talking about Big Nate Island when you are in Detention. Well, it is VERY simlple. You click on the second drawer on the file cabinet. Very simple.
You have to use your stink bomb you made in the science room.Then the women will leave the room.Go to the cabinet click on the bottom of the cabinet and it will open.
you set off the stink bawlm mix yellow and blue and heat it
You need have the blue print first (When You unlock the locker with the combo from the comic then click on the 'FOOM" papers near the papers)
Get detention Set down stink bomb Click file cabinet
Click the locker again and you will get a map of the school, revealing a secret room under the file cabinet.
you put the stink bomb on the ground in the detention room that you made in the science lab. the teacher walk out.
Set it off after you chew gum and get in detention. It will get rid of the teacher and you can enter the room behind the filing cabinet. (If you don't have the blueprint, go out and open Nate's locker to get it. The teacher is permanently gone.
In the detention room, Use the stink bomb to send the teacher out, then click on the desk.
in the detention room.