The first time, you have no choice. Fix the saucer and launch it (see the related question).
Once you have a spaceship, you can land on Poptropica, the Pewter Moon, or any planet by clicking on it. (The exception is the ice planet, see related question)
It is on tp of the castle roof in astro knight island
From the Pewter Moon (X-56 Y-52) , travel up and right to reach the fire planet at X-83 Y-20. When you are near the planet, click on it to land. (see related question)
If you land back on Poptropica, your spaceship is parked atop the castle. This is also its location when you have beaten the island.
If you land on earth with your space ship, it will be on top of the castle waiting for you!
When you are in the spaceship (solar system) view, click on the moon or planet you want to land on. To leave again, use the "launch" lever.
Jump across the four Phoenix Eggs from the rope on the left. Key : jump when the egg is OPEN...by the time you land, it is closed.
* On Astro Knights Island, you must return to the planet Poptropica (X-56 Y-52) and land there. Your spaceship parks on top of the castle, and you can go left from there to reach the blimp.* On Time Tangled Island, use your time device set to the "Lab" setting, which is right outside Pendulum's lab on Main Street. Go left to reach the blimp.
The phoenix eggs on astro knights island are in space.It is in jungle planet.To go in space you have to crash the small ship and build your own ship.Go to jungle planet and jump on the things swinging until you land on a robot platform kind of thing.(Watch the robot worms) Go right and you should see the phoenix eggs.
Dodge their shots and fire back : three shots should knock any of them out. But you don't have to fight them, just get to a planet and land.
Talk to the head mechanic at Astrozone and get a new spaceship. Then you can go to the planets on the Queen's coordinate list (jungle, fire, and ice planets).
You have to beat all three planets : fire, ice, and jungle, and then return with the three knights to the mystery asteroid and pull the Golden Key. (see related question)
When you crash land on the Pewter Moon, go to the mechanic inside the big building to your right (Astrozone). When you come back, use the holo-pad to design your ship. (The design actually makes very little difference in the effectiveness of the spaceship.) You can re-design anything by returning to the holo-pad on the moon.