First you have to make the haunted clocks go at the same speed by clicking on them. both are supposed to have the skeletons jump out
In the fire place.
The LANTERN is one of the four special items you have to collect in the Haunted House. The ghostly cat will tell you where to take them. There is fuel for the lantern in the basement. (see related question)
When you get the lantern go down stairs and find a barrel and click it. Then the lantern will light up.
It is red... like your average lantern.... you have to play with the clocks to get it though... look up "Haunted House Poptropica Walk-through if you want to know how to beat the clocks.
To light the lantern in the haunted house you have to go to the floor you came in on and click on the kerosene barrel.
There is a barrel of kerosene in the basement.
get kerasoene barrle and click on the candle.
There is a barrel of kerosene under the stairs in the basement (where you entered). Click on it to fill the lantern.
You go down in the basement where you entered the house. Below the steps is a barrel. Click on the barrel and your lantern will be lit.
Go into the celler and under the steps is a tub .Click on it and that will fill up your lantern.
you get it when both clocks strike midnight at the same time.
There is a barrel of kerosene near the entrance to the basement.