Each key has a symbol its end that corresponds to the symbol etched into the door near each of the circular displays. Drag each key into the screen in the top middle of the door, and the screen will display a letter. Click the red button next to the symbol that corresponds to the key so that it turns green, and use the rotating dial at the bottom of the door to rotate to the corresponding letter. Repeat for each key until you've spelled out the word.

Hi Master,
Thanks for the tip. I managed to unlock it by myself,haha,thanks anyway