When you have recovered a fuel rod for the saucer, the instrument will let you use the X and Y dials to set the coordinates. But the planet coordinates the Queen gave you are too far away. You will need to use the coordinates from Mordred's missing journal page, which are X-56 Y-52. (see related question)
We click on it and drag it to the empty fuel line which has the fuel (the green thing) dripping out of it.
with the manure
You have to get the fuel rod
56,52
get the fuel stick in the dungen using the owl
All you have to do is put the manure in it. [ If you are talking about the one in the windmill.
you put it into the spaceship ontop of the mill
The one far back in the muddy swamp.
you have to fill the spaceship up with the green fuel.4838439456846678643497662672+62+854+6782+7825+72+2+72+6271752627175917519792179221792197229129725
After you get the over craft from the mill in poptropica, you go all the way right, on the hover craft, over the mud, to a crashed spaceship. You have to have the fuel from the alien in the dungeon in the library to start the engine to the spaceship.
You get in the spaceship, and click on the control panel and press launch.
Yes, a spaceship will eventually run out of fuel if it does not have a way to refuel in space. Once the fuel is depleted, the spaceship will no longer be able to accelerate or maneuver effectively.