Missing customization

Hi there!

I have tested the free account in wordpress.com and installed wordpress at my site. I like the rowling theme, but in my installation I cannot customize the color scheme. Here are screenshots:
In wordpress.com:
http://renim.me/tmp/c3.png
My installation:
http://renim.me/tmp/c1.png
http://renim.me/tmp/c2.png

Why is that?

Thank you in advance!

BR,
Renim