All you need to do is jump on the broom and it will follow the mouse while you are on it.
put the broom under him, and go up
Click on the spider in the kitchen and the broom will go off the witch.
In the third floor room (right), click the spider just under the floor. It will scare the painting of the witch, and you can use her broom to fly into the attic.
Click on the spider above the witch. She will drop the broom and you can ride on it.
If you need the broom on Poptropica, I can assume you have gotten to that point and do not need and coaching on the earlier points of the island. To get the broom, you have to go up the left staircase and find the portrait of the witch, who will now be under you and seems scared of the spider that is above her. Click on the spider and she will be so frightened that she drops her broom. Her broom will follow you and you only need to move your mouse to fly once you're on it.
Some have people and some dont. You need two use a witchs broom in a picture
To enter the attic through the hole in the ceiling, click on the spider by the door. He will scare the witch and you can ride her flying broom.
Go to the third floor room (right) and click on the spider. You can use the witch's broom to fly to the attic and get the Chalice from the chest.
There are no balloons. To reach the attic through the hole in the ceiling, click on the spider by the door. He will scare the witch and you can ride her broom into the attic.
Go to the room above the spider (third floor right) and click on it. You can use the witch's broom to reach the chest in the attic.
Climb up. To reach the attic inside, click the spider by the door and it will scare the painting of the witch. Use her broom to fly into the attic.