Wouldn't that be right below the HDRprobe you've just loaded, and i think, labeled exposure or contrast,or both?...also to the right I think you can reload the image as a seperate exposure control, don't have Vue up right now so I'm a bit sketchy on this as this old computer don't render all that fast so I've but looked at that page.

 

Once in a while I look around,
I see a sound
and try to write it down
Sometimes they come out very soft
Tinkling light sound
The Sun comes up again