Once you have the flag you go to the very right side of town and talk to the guy up the rope on the far right side.
the flag is on top of the poptropica water tank
Once you have the jetpack go through the hole that is near the giant shovel then you will be on the watertower where the flag is hope this helped!
If you are asking about the flag in new poptropica.. then the flag is on the water tower that is leaking. If it is something else, tell me
Once you return the flag to the tower on early poptropica, head right and you'll see a ship with an early poptropican on it. Talk to him to receive the medallion.
Once the pig, water bucket, and flag are returned, the signal flag will be raised and a ship will dock at the pier to the right. Go aboard and the captain will award you the Island Medallion.
Once you return the three items, the island is complete. The signal flag will be raised, and a ship will dock at the Early Poptropica harbor. The captain will give you the Island Medallion.
The sailing ship will dock at the far right of the island, in Early Poptropica village, once the signal flag is returned. Once you have located the missing items for the townspeople, the captain of the ship will give you the island medallion.
The flag is on top of the Water Tower in Early Poptropica. You will need the jetpack to reach it. (see related question)
easy man! when you got it, put that on the ring,the were is near the camp.
When he points at one you pick the opposite one!
Once i went to one of the islands and somehow got a new player
yes there is a flag in poptropica it is on the water tower but I don't know how to get up there if you talk to the guy standing by the water tower he will tell you it is up there