When you get a new fuel rod, just place it in the spot on the saucer and it will lock in.
(see related question)
You get the alien "fuel rod" from the robot invader in the dungeon, and use it to power the saucer Excalibur, so you can go to space. (see related question)
Once you have a new fuel rod, dial in the coordinates X-56 Y-52 to launch the saucer. (see related questions)
There is no jail on Astro Knights Island. There is a castle dungeon, where an attacking alien robot is being held after his capture. (see the related question)
Terd on the toilate
u just press on it
This means you have already completed the Arturus part of Astro Knights Island. Your spaceship should be parked on top of the castle if you return to the planet.
On the Pewter Moon, see the manager at AstroZone about replacing your ship.
Get the hovercraft from the mill attic and fix the saucer that is crashed out in the swamp to the right of the mill. Once you set the coordinates to the Pewter Moon, you can travel there. You will build a new spaceship to travel to the three planets that the space knights have gone to. (see the related questions)
you get the fuel rod and enter the coordinates then you go to astrozone and ask the alien to use a ship
The Princess Is Held By Alien's.
On Astro Knights Island, you need a power source for the saucer Excalibur. Since you have used your manure, you need another power source. Although the green fuel rod is broken, the alien invader in the castle dungeon probably uses the same type of power. Go into the Dungeon by way of Mordred's underground lab. (see related question) There's only enough power to reach X-52 Y-56, the robot moon, so enter those coordinates and press launch. When you reach the Pewter Moon, you will exchange the saucer and build your own new spaceship.
You ask the alien manager of the store then you can make your own rocket. E Z .