It means you have to get lemon and the page and put it under the light to reveal the secret message.
You jump on the light on CJ's desk and turn it on. Then you click use on the lemon paper and watch the paper turn brown.
i forgot how to explain it but i know it!!
In Shrink Ray Island, to turn on the light, you need to find the switch or button located in the light fixture. Once the light is on, place the paper with lemon juice underneath the light source to reveal any hidden messages or drawings. Ensure the paper is positioned correctly to maximize exposure to the light. This will allow you to progress in the game and uncover important clues.
you go to the laptop room there is something by the right side of the light you will know what to do then good luck (and if you click on the rucksack and if you have the thumb drive put it in the computer)
It is on a shelf above the computer desk. You need the key (from the aquarium) and the torn page (from the trash can in the kitchen).
in the subway
Put it under the light!
you do not
on top of the lighthouse
The trash can. You find the car and drive it to the trash can. Use it as a stepstool to got into the trash can.
Al the way 2 the right of the island
You go down the well.