protein skimmer issue

Guys,
When I setup my tank, I bought a "Hang-On Wet/Dry Filter" with a built in
Protein skimmer. I did this because there is very little space where the
tank is. I literally cut a hole in the wall and dropped it in there.
Anyway, foam does get created by the protein skimmer, but the foam does not
get into the collection cup. It sits right below the point where it will
fall into the cup. How can I adjust it so the foam makes it into the cup?
I have had this tank up since October and have yet to clean the skimmer cup.

Picture of the filter/skimmer http://www.bighaig.com/algae/wetdry.gif
or
http://www.drsfostersmith.com/produc...N=200 4+22778

Thanks