You go into the Surveillance room Via the security room or the tunnel in the museum tour (near the mimes).
You can review the surveillance videos once you have the timecard from the museum guard. You can find him at the Clown Store.
Go into the bottom right room and see all the videos. Then mews will show up.
Go to the Clown store and get the time card from the museum guard. with that, you can narrow the time to see the theft on the museum's Security Room videos. Get a photo of the thief (it's the shady guy) and show it Downtown.
When the painting is stolen, get the timecard from the night security guard (he's in the Clown Store). Then you can see the theft on the videos in the Security Room of the museum.
He should appear in the museum or the lab (to the left) after you have watched all of the videos in the museum.
At the museum, you can't enter until you have taken the Underground Tunnel Tour. (see related question)
You will find the missing security guard in the Clown Store. He will give you his time card, showing when he was out of the museum gallery. With the card, you will see the proper time on the security videos, and print out a photo of the thief.
You go in the blimp. *Ordinarily, you would be leaving the island, but on Counterfeit Island, there is a special link that lets you go to the other island and meet the curator at the Pop Art museum. Although you could play Early Poptropica while you are there, it could create conflicts with Counterfeit Island. See the curator and return to Counterfeit Island again on the blimp.
Once you have taken the Underground Tour, you can apply for the job at the museum, where it is hanging in the upper gallery.
When you have beaten the Black Widow, return to the Museum Fantastique, where the curator will give you the Island Medallion. She will also reveal the secret art treasures hidden in the museum. *For the full solution to the island, see the related questions below
You can't apply for the job at the museum until you have taken the Underground Tour. (see related question)
you go to the pictures and the onr that i mean is the picture called the scream and click and you'll see what happens