You can change a lot without going into Skinstudio at all. First you have to go into the skin itself. On win7: My Computer, C drive, Users, Public, Public Documents, Stardock, Windowblinds. Open the skin you want to fiddle with. There will be all the parts to the skin there. You'll need a graphics program that opens TGA files and Bitmap files. What I do is make a folder in My Documents and name it for the skin I am playing with. I copy the part of the skin that I am changing into that folder so I always have the original in case things go bad. Whatever I change I put into the original folder for the skin. When you want to see how the change looks you have to re apply the skin.

I use Skinstudio sometimes too. Bottom line is that you have to play with this a lot and don't be afraid to make mistakes. As I said it's good to make copies of the original files.

I can't see anything like SkinStudio at the link you posted. Not even in MyDownloads.

https://www.stardock.com/products/skinstudio/ as far as i know there is a pro and a free version i might be wrong tho
or you try the way Chasbo posted
 

the skinstudio7 folder is located within the windowblinds folder. When you make something and save that into a .wba package this is where that file is saved to.

just a suggestion; open the windowblind that you want to change and save it by some other name.

you don't need to create a .wba package to view your changes, just click on the save button and then apply button from within skinstudio.

And there's no skinstudio7 folder in my Windowblinds folder.

I'm using the trial version. I can't afford the complete version. And I downloaded the program from it's own site.

I've sent an e-mail to them. Now I'm waiting...

Here it is: DFE-676-80314