The crashed saucer Excalibur is in the mud swamp right of the Mill. Use the hovercraft to reach it, and get a new green fuel rod to power it up. The coordinates for the saucer are on the missing page of Mordred's Journal (under his bed).
(see the related questions)
None of the computers on Arturus work because there's no power for them.
You can not do anything, except move on to another island.
pick up the fuel rod and connet and put the rolling things on 56x52
The key in the dungeon doesn't work. You throw the switch and come into the cell from the back way. (see the related question)
Its not working because you have the wrong numbers the wright ones are x-56 y-52
You use the manure to power it!
The hovercraft (hover board) runs on manure, so get some from the farm and add it. The hovercraft will go directly to the mud swamp, which is the only place it will work.
The Kingdom of Arturus is on an island on the planet Poptropica. The people deposed their king, Mordred, twenty years ago for his work on cybernetic creatures: part animal, part machine. The kingdom was attacked by robot warriors and the Princess kidnapped. Find her and defeat the robotic creations of her captor. (see related question)
Once you have opened the attic dome, you can add manure to make the hovercraft work. To open the attic, release the gear lock and turn the windmill arms counter-clockwise.
There are no plants to click on. You click on the lower shelf in the castle library (McM) and click the "planets" when you arrive at them. On the Jungle Planet, the elevator plants work automatically when you jump onto them.
The coordinates dial on the saucer Excalibur will not work until you replace the damaged green fuel rod. Then you must enter the only coordinates that will work, which are X-56 Y-52. (see related question)
The costumizer does not work on the scene sequences, only on the interactive characters. If you want to look like Binary Bard or Mordred, you will need to locate an identical individual (or figure out the code for the randomizer).