After you ask the guard on otoh gunga to open the door for you their is another door with a red circle on it. How do I open this door? help!!

I think you need a red key.. don't ask me where to find one though.

; L~

"the grass is always greener"

Opposite the red circle door, there is a hallway that slopes down. Follow the hallway into another room, with 3 pillars, a pushblock, and a glass-covered floor area with a corresponding green circle below. What you have to do is push the block to each of the consoles, press a button that lowers a pillar, then move the block to the next console. Repeat until the glass disappears, jump down on top of the green circle. That will turn the circle red, and open the door up the hallway for you to continue.