(* Although a wind turbine uses the term "blades", windmills usually use the term "arms".)
To get the windmill arms to turn, go inside the mill and pull the rope on the second floor, releasing the lock. Jump on the arms to turn them counter-clockwise and the roof dome of the mill will open.
(see related question)
1:turn the windmill blades clockwise
The windmill is at the far right side of the island. There are three areas : the Village, the Castle, and the Mill.
go pass the windmill and on the ladder is the rope.
The rope is on the water wheel on the right side of the windmill.
The attic of the windmill doesn't have a key, only an ingenious secret. (see the releated question)
To get to the top of the windmill in Astro Knights Island in Poptropica, you need to reach the area with the moving platforms. Time your jumps carefully to navigate across the platforms and reach the top of the windmill. Keep in mind the patterns of the moving platforms to successfully make your way to the top.
Follow Don Quixote.
in the top of the windmill
you have to unlock the windmill
Keep going to the right until you reach the windmill, which is the third section of the Island (the other two are the village and the castle).
You do not get or use a bucket on Astro Knights Island.
You use it to power the hover board (hovercraft) in the attic of the windmill. (see related question)