How do you get the alien spacecraft to fly on poptropica?

There are three spaceships in Astro-Knights. One: The one in the Ye Olde Rumour Mille's attic runs on manure. Two: The one in the mud runs on a green bar. The way you get the green bar is going into Mordred's hide out and pushing that wall out of the way. Keep on going until you see a hole in the wall. Go through that hole. You will get to a dungeon, where a huge flying robot will self-desruct. The green bar will go flying out. Run over there, and send the owlto go retreive it. Three: The one you get at the moon. You go inside it, then click on the lever.