All files you need are in the folder Accessories.
You need for the changes Adobe Photoshop, Swish Max.
For the changes you can download trail-versions.

Macromedia Flash MX >> http://www.macromedia.com/
Swish Max >> http://www.Swishzone.com/
Adobe Photoshop 7.0 or higher >> http://www.adobe.com/

Topic: *Note you can create your own Topics. The original file is the<<Topic.psd>>
Save the changed fils as .gif and upload it to your Topic-Folder.... Thats all :)

Fonts:
Copy them to your fonts directory which you can reach from control panel

And you need Swish-Max to change the -Header_Flash_1.swi and Header_Flash_2.swi
You have the option to change the background Ambiente or some anothers .....
Export it as Header_Flash_1.swf and the other one as Header_Flash_2.swf and overwrite the old files.
Note: Header_Flash_1.swi includes the ambiente !!