Okay
here's the deal. on my bike which is campy-equipped, i have a long lever on the front of the handlebars which is also a brake. There is one of those on each side, and on the inside of that there's a little thumb lever.
now, when you want to move the chain of your Campy equipped bike to the left, you move the right button or right lever towards the direction you want your chain to go.

That's all there is to it!

The left hand operates the 3 big chain rings. When I want the chain to go up to the big ring to go really fast, I just shove that left lever over to the right; where it is; and it goes there.
The right hand does the same thing. When I want to push the chain up to the big ring in the back, to go up a hill, i just push that lever to the left.

I don't believe that's how the Shimano stuff worked.