All you need to do is jump on the broom and it will follow the mouse while you are on it.
Find the spider in the haunted house,Then you click on it.Get the broom below the spider and fly up.
Click on the spider in the kitchen and the broom will go off the witch.
you scare the witch painting with the spider and get on the broom fly up.
Click on the spider above the witch. She will drop the broom and you can ride on it.
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.
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.
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.
The spider is in the third floor room (right). Click it and it will drop down and scare the witch in the painting, and she will drop her broom. Jump on it to fly into the attic.
It is below the floor in the upper room at the right. Click it and it will drop down and scare the witch in the painting, and she will drop her broom. Jump on it to fly into the attic.
To reach the attic, you will need the "flying broomstick" (which only works inside the Haunted House). Go to the third floor room where the "Cupid" statue is, and you will see a spider on the floor. Click on it and the spider will drop down, scaring the witch in the painting, and she will drop her broom. Jump onto the broom to fly on it. Slowly steer it up the stairway, through the room, and into the attic. (The chalice is in the chest.) (see the related question)
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.
It is along the stairway. Go to the third floor room (right) and click the spider. It will drop down and scare the witch. She drops her flying broom and you can use it to fly into the attic.