there's a part called layer adjustments, it got like lighten screen overlay, etc. Click on that and try to experiment. Believe you'll get better at it. ;D
I clicked on this link hoping for "Intermediate" work as advertised. This is not intermediate. You are a beginner. Good luck, though. Just don't mislead people.
My school has the adobe suit CS5. I used to use the PS to make small sigs but I stopped the shop as I found I wasn't very good nor did I have the time.