Place it on the offering stand in Hades throne room.
To open the underground door on Mythology Island in Poptropica, you need to retrieve the trident from Poseidon. Once you have the trident, use it to unlock the door and access the underground area. Good luck!
To get to hades castle: Go all the way to the end of the island and there is his castle. There will be an offering table. Find pomegranates and put them on the table. A door will open. Take it from there.
Get the pomegranates from the tree in the garden of the Sphinx, and put them on the altar.
There are pomegranates in the Garden, just above the Sphinx. Place them on the altar to open the door into the Underworld.
They DON'T open both. The pomegranates only open Hades' door to the underworld put them on his alter in Mythology Island. To open Poseidon's door to his his awesome beach, you need the starfish off of his statue in the museum.
You give the pomegranates to the Underworld god, Hades. You walk over to the locked door then use the pomegranates. Your person puts the pomegranate on the table and the door opens.
you get a pomagranet from the garden of the sphinx and place it on Hade's alter at his palace. The alter is by the door. The door will then open.
you have to get the pomegranates
Go to Hades's temple (right of Main Street) and place them on the altar by clicking "use." This will open the door to Hades' realm.
Go to Hades's temple (right of Main Street) and place them on the altar by clicking "use." This will open the door to Hades' realm.
Go find the Pomegranates. Go to the Grove of Temples. Then, continue going left until you get to Hades Temple. Go into his temple, and place the pomegranates on the offering podium. Go into the door and fall and fall. You will get to the river Styx. Go to that.
with Hercules, use the mirror Aphrodite gave you to travel to the underworld. there Hercules will move the bolder for you and you must go in and speak with Hades. there he will give you the helm.