You go left until you reach the castle and then you go upstairs and talk to the queen. She should give you the coordinates. (they didn't really work for me, so i just looked at the map.)
Go on youtube
The island that uses spacecraft to travel through the quest is Astro Knights Island.
x83 y49
The coordinates are X 11, Y 82
Go to the throne room on the second floor of the castle.
You don't type it. You have to guide your spaceship there.
It is on the Fire Planet. The Fire Planet's coordinates are 83, 20.
What you do is when you go up into space you click on the coordinates and you follow tem
You do not get or use a bucket on Astro Knights Island.
The planet Poptropica has the same coordinates as the Pewter Moon : X-56 Y-52.
There is no treasure chest on Astro Knights Island.
The coordinates are locations (destinations) that are entered on the dials in the saucer Excalibur. When you have a new spaceship, the coordinates are displayed in the screen to tell you where you are. (see related question)