If you mean for the original ship powered by the fuel rod, you never need to replace it. You will crash on the moon and you will make a new rocket for your travels. And if you run out of shields with the rocket, you will automatically be teleported to the moon and the shields will be replenished.
I forgot
the dung
no
it is in the dungen cell.
You already have it
go to the mill and get the ship
You have to get the fuel rod
by letting the fuel battery charge. Yes, but how do you charge the battery?!
You use the manure that the man gives you
i do not know what you are talking about
In Astro Knights Island on Poptropica, the fuel for the hovercraft can be found in the fuel canisters located next to the dock where you first arrive on the island. You need to collect the fuel canister and use it to power the hovercraft to cross the toxic swamp.
Actually, Merlin has little to do on Astro Knights Island. He recovers the fuel rod from the dungeon when the robot self-destructs. And he battles Mordred at the very end of the island.