I am not completely sure, but i think you have to have a particular scroll or pamphlet
you click on the owl then click the green stick.
Its behind the McM thing I cant click it -----{---@ YOU SUCK LOLOLOLOLOLOLOLOLOLOLOLOLOL
To get the green tube in Poptropica's Astro Knights Island, you need to visit the castle courtyard and find the robot seahorse in the fountain. Ride the seahorse up to the top of the fountain to retrieve the green tube.
In the library on the bottom floor there is a green brick on the wall click on it .it will lead you to the dungen.
When you get in the space shuttle the big green screen on the "dashboard" if you click it then it will tell you where planets are including the fire planet
Go to the king and queen and they will tell you.
click the owl then click the green thing and wala.
click on the owl, then click on the green bar. The owl will get it
you go into the windmill there will be a glow stick on top of a box.
Click on Merlin (the mechanical owl) and the click on the "green thingy." Bingo! ;D
click on them and click the words in green.
After you go to the bard's secret cave underground, go to left and push. Keep pushing until the wall breaks, then click on Merlin the owl, then on the green fuel bar.