You don;t shrink it. Once you have recovered the key to CJ's diary (in the fish tank), the diary page (in the kitchen trash), and the note (on the table), you can use CJ's computer password to back up her information on the computer, then flush the thumb drive to keep it away from the thief.
(see related question)
plug it into the computer
If you have the lost thumb drive you insert it the computer to save
- The answer to the Morse code on Poptripica" Shrink ray island is "Flush The thumb Drive'
Get to the castle
in the tolit in the bathroom
type m4r13 cur13
flush it down the toilet
flush the thumb drive.
MrSilva has the shrink ray he is the one who stole it and shrinks you
After you flush the thumb drive, go to CJ's room and she will send you another message.
Under the bed in the girl's room
Flush the thumb drive