I saw the photos that Elke posted, I guess, in response to the follow-through questions here, but from them it seems that the skimmer is working well and there's a good deal of foam already.
Elke...I have a different kind of skimmer but I don't think that matters...the foam that mine makes after I clean it (which you have to do very regularly, by the way) comes out a nice clean looking white. After a day or so, a darkish gook starts showing up on the inside wall of each of the two plastic containers. The liquid that collects in the skimmate collection cub (the one on the very top) should be really dark smelly. You'll see when you empty it out. If it is like that, then you know that the skimmer is doing what it's supposed to and it's working fine.
Something's gotta go wrong cause I'm feeling way too **** good.