Actually, that's about it when it comes to adding a StyleBuilder generated skin:
1) create a directory, usually called styles in the root of your project;
2) create a directory with the name of the skin e.g. MySkin
3) place all the files and directories in that folder
4) reference the styles from a (master) page.
Could you make a video recording of how you are adding the stylesheets? You can use Jing which is free and just paste the link in this post.
All the best,
the Telerik team
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