theme usage in drupal common

Hi
I am trying to use ddblock themes downloaded form http://ddblock.myalbums.biz/ and follow the tutorial saying i have to extract the ddblock's theme folder "custom" in my the default site the witch is "common original" not located in sites/all/theme/my-theme as expected.
The common original theme is in the profile directory. i place inside the ddblock themes folder custom, but no themes are load in the block's user interface.

I need a help to solve this.

Thanks