How to use Skinstudio to modify toolbar

OK. I want to decrease the height of toolbars of some themes

I tried Skinstudio free version, man, this software is so complicated...I have no clue what should I do.

Also I want to change the font size too..I dont know how to do this either..Ahh....

Can anyone write a simple tutorial for me?

that would be awesome

somebody help? man..its been one day..nobody helps me?