Sands Of Destruction Azure Sea tower

I entered the tower, and I can't find a way to get to the boss. Theres 2 lights one green and red and when i click on one nothing changes on the map. What am I supposed to do? I'm at the entrance floor.

When you click on the switch,go up the stairs.
The change happens upstairs.

So is the left circle supposed to be red?

I forgot which circle is suppose to be red,sorry >.<

You can easily find it though, click one and go upstair.
If it's wrong, go back and click the other one.