It's a little tricky, figuring out exactly where to click. It goes something like this:
- notice the little cave entryway in the lower left
- hover your cursor inside the entryway
Here's the trick:
- if you can see the little green circle, do NOT click; you'll just end up stuck in the entryway, blocking the way in, and basically open yourself up to being mocked by the other people in the room
- instead, move the cursor a little to the left, or up, JUST until the green circle disappears (it'll look like you are clicking on the WALL to the left of the entryway); and THEN click
Good luck.